Side by side comparison and review of OPPO Reno4 Z 5G and Samsung Galaxy S21 Ultra 5G. Compare sizes, cameras, batteries, memory capacities and other key specifications and features to simplify the choice of your perfect phone. Our goal is to make it easier for you to decide on the phone that will best meet your expectations by revealing the main differences between the products.
| DESIGN AND DIMENSIONS | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | CPH2065 | SM-G998B/DS | |
| Form Factor | Touch | Touch | |
| Height | 163.8 mm | 161.5 mm | OPPO Reno4 Z 5G has greater height than Samsung Galaxy S21 Ultra 5G. |
| Width | 75.5 mm | 75.6 mm | Samsung Galaxy S21 Ultra 5G has greater width than OPPO Reno4 Z 5G. |
| Depth | 8.1 mm | 8.9 mm | OPPO Reno4 Z 5G is narrower than OPPO Reno4 Z 5G. |
| Weight | 184 g | 227 g | OPPO Reno4 Z 5G is lighter than OPPO Reno4 Z 5G. |
| Body Colour | Ink black | Dew white | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | |
| Protection | - | Dustproof, splashproof, water-resistant | |
| Waterproof (Water-resistant) | - | Yes | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | - | IP68 | |
| SAR Value | 0.905 W/kg (head), 0.88 W/kg (head), 2.686 W/kg (limb) | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LTPS | Infinity-O Dynamic AMOLED 2X | |
| Screen Size (Display Size) | 6.57" | 6.8" | Samsung Galaxy S21 Ultra 5G has larger screen size than OPPO Reno4 Z 5G. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 3200 x 1440 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than OPPO Reno4 Z 5G. |
| Display Format | Full HD+ | QHD+ | |
| Pixel Density | 401 ppi | 515 ppi | Samsung Galaxy S21 Ultra 5G has better pixel density than OPPO Reno4 Z 5G. |
| Max Brightness | 480 cd/m² | - | |
| Colour Depth | 16.7 million colours | 16.7 million colours | Both phones have the same color depth. |
| Contrast Ratio | 1500:1 | - | |
| HDR | - | Yes | Samsung Galaxy S21 Ultra 5G has HDR. |
| HDR Technology | - | HDR10+ | |
| Display Enhancement Technology | - | Eye Comfort Shield | |
| Display Refresh Rate | 120 Hz | 120 Hz | Both phones have the same refresh rate. |
| Touch Sampling Rate | 120 Hz | - | |
| Display Features | Dark mode | Edge Screen, AOD(Always On Display) | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 3 (scratch resistant glass) | Corning Gorilla Glass Victus (scratch resistant glass) |
| PROCESSOR | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Processor Type (CPU) | MediaTek Dimensity 800 5G | Samsung Exynos 2100 | |
|---|---|---|---|
| Processor Number | MT6873V | - | |
| Clock Speed | 2 GHz | 2.9 GHz | Samsung Galaxy S21 Ultra 5G has higher clock speed than OPPO Reno4 Z 5G. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G57 MC4 | Mali-G78 MP14 |
| MEMORY | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| RAM | LPDDR4X SDRAM - 8 GB | LPDDR5 SDRAM - 12 GB | Samsung Galaxy S21 Ultra 5G has more RAM than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 128 GB | Both phones have the same internal memory capacity. |
| User Memory | - | 101.7 GB | |
| Memory Interface | UFS 2.1 | - |
| CAMERA | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 4 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 12 Megapixel | OPPO Reno4 Z 5G has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Sensor Size | 1/2" | - | |
| Lens Type | - | Ultra wide-angle lens | |
| Lens Aperture | F/1.7 | F/2.2 | OPPO Reno4 Z 5G has better lens aperture than OPPO Reno4 Z 5G. |
| Lens Construction | 6-element | - | |
| Field of View (FoV) | - | 120 degree(s) | |
| Pixel Size | 0.8 μm | 1.4 μm | Samsung Galaxy S21 Ultra 5G has larger camera pixel size than OPPO Reno4 Z 5G. |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Samsung Galaxy S21 Ultra 5G has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | - | Yes | |
| Minimum Focal Length (Focal Distance) | 25 mm | - | |
| Optical Zoom | - | 3x | |
| Digital Zoom | - | 100x | |
| Self-Timer Delay | - | Yes | |
| Special Effects | Live HDR, Bokeh effect, Stickers | Face retouch, Grid Line | |
| HDR Mode | - | Auto HDR mode | |
| Camera Modes | Panorama, Time-lapse mode, Slow motion mode, Expert Mode, Portrait, Night, Dazzle Colour Mode, Ultra dark mode | Panorama, Slow motion mode, Pro mode, HYPERLAPSE, Super Slow-mo, Flowers, Greenery, Trees, Sky, Beaches, Watersides, Snow, Backlit, Text, Food, Face, Baby, Person, Dog, Cat, People, Sunset, Sunrise, City, Waterfall, Scenery, Stage, Vehicles, Drinks, Animal, Shoes, Indoor, Clothes, Night view, Night, Motion Photo, Mountain, Single Take, Pro Video, Director's View | |
| Light Source | LED flash | High CRI LED flash | |
| Still Image Resolutions | 8000 x 6000 | - | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 30 fps | 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 60 fps, Super slow motion video 1280 x 720 (720p) at 960 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, 7680 x 4320 (UHD 8K) at 24fps, Hyperlapse 4K video support at 30 fps, Super Steady 1080p video support at 60 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), EIS video stabilisation, Ultra Steady Video, contrast detection auto-focus (CDAF), 4-in-1 pixel binning | Playback zoom, blink detection, VDIS (Video Digital Image Stabilisation), Tracking AF, Video location tags, Scene Optimiser, Flaw detection, Shot suggestions, blur detection, HDR10+ recording, Super steady, Quick Measure, Zoom-In Mic, Space Zoom, Take 33MP still photos while playing 8K video, Hybrid Optic Zoom 3x, Super Resolution Zoom up to 30x, Digital zoom up to 12x for video |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | 108 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Sensor Size (2nd Camera) | - | 1/1.33" | |
| Lens Type (2nd Camera) | Ultra wide-angle lens | Wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.2 | F/1.8 | Samsung Galaxy S21 Ultra 5G has better second camera lens aperture than OPPO Reno4 Z 5G. |
| Lens Element Qty (2nd Camera) | 5-element | - | |
| Field of View (2nd Camera) | 119 degree(s) | 83 degree(s) | OPPO Reno4 Z 5G has larger second camera lens field of view than Samsung Galaxy S21 Ultra 5G. |
| Pixel Size (2nd Camera) | 1.12 μm | 0.8 μm | OPPO Reno4 Z 5G has larger second camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Minimum Focal Length (2nd Camera) | 16 mm | - | |
| Camera Features (2nd Camera) | 5-piece lens | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | 10 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Lens Type (3rd Camera) | - | Telephoto lens | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Lens Element Qty (3rd Camera) | 3-element | - | |
| Field of View (3rd Camera) | - | 35 degree(s) | |
| Pixel Size (3rd Camera) | 1.75 μm | 1.22 μm | OPPO Reno4 Z 5G has larger third camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Camera Features (3rd Camera) | - | Dual Pixel AF |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | 10 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution fourth camera than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Lens Type (4th Camera) | - | Telephoto lens | |
| Lens Aperture (4th Camera) | F/2.4 | F/4.9 | OPPO Reno4 Z 5G has better fourth camera lens aperture than OPPO Reno4 Z 5G. |
| Lens Element Qty (4th Camera) | 3-element | - | |
| Field of View (4th Camera) | - | 10 degree(s) | |
| Pixel Size (4th Camera) | 1.75 μm | 1.22 μm | OPPO Reno4 Z 5G has larger fourth camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Camera Functions (4th Camera) | Monochrome | - | |
| Camera Features (4th Camera) | - | Dual Pixel AF |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 2 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 16 Megapixel | 40 Megapixels | Samsung Galaxy S21 Ultra 5G has better front camera resolution than OPPO Reno4 Z 5G. |
| Lens Aperture (Front) | F/2.0 | F/2.2 | OPPO Reno4 Z 5G has better front lens aperture than OPPO Reno4 Z 5G. |
| Field of View (Front) | - | 80 degree(s) | |
| Pixel Size (Front) | 1 μm | 0.7 μm | OPPO Reno4 Z 5G has larger front camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Focus Adjustment | - | Automatic | |
| Special Effects (Front) | HDR | - | |
| Camera Modes (Front) | Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, Portrait | - | |
| Light Source (Front) | Display flash | - | |
| Still Image Resolutions (Front) | 4608 x 3456 | - | |
| Video Resolutions (Front) | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | - | |
| Camera Features (Front) | 5P lens | Phase Detect Auto-Focus (PDAF) |
| SECOND FRONT CAMERA |
|---|
| Sensor Resolution (2nd Front) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (2nd Front) | F/2.4 | - | |
| Pixel Size (2nd Front) | 1.75 μm | - | |
| Camera Functions (2nd Front) | 3D depth camera | - | |
| Camera Features (2nd Front) | 3-piece lens | - |
| BATTERY AND CHARGING | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Battery Capacity (Battery Size) | 4000 mAh | 5000 mAh | Samsung Galaxy S21 Ultra 5G has larger battery capacity than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Fast Charging Technology | - | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Samsung Super Fast Charging, Power Delivery 3.0 | Samsung Galaxy S21 Ultra 5G has fast charging technology. |
| Recharge Time (Charging Time) | 116 min | - | |
| Wireless Charging | - | Yes | Samsung Galaxy S21 Ultra 5G can be charged wirelessly. |
| Wireless Charging Standards | - | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare | |
| Talk Time | - | 2460 minutes | |
| Run Time Details | - | Talk (4G): up to 2460 min Active online usage (LTE): up to 18 hrs Active online usage (Wi-Fi): up to 18 hrs Playback (wireless video): up to 22 hrs Playback (wireless audio): up to 81 hrs |
|
| Battery Technology | Lithium Ion | - |
| CELLULAR | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | ColorOS 7.1 (based on Android 10) | Android 11 | |
| Intelligent Assistant | - | Bixby | |
| Payment Technology | - | Samsung Pay | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS | GPS, GLONASS, BeiDou, Galileo |
| COMMUNICATIONS | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, VoLTE, FDD-LTE, TDD-LTE, 5G NR FR1 | FDD-LTE, TDD-LTE, 5G NR FR1 | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19 | Band 1, Band 2, Band 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 800, 900, 800 | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 38, Band 39, Band 40, Band 41, Band 66 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 66 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | |
| 5G NR Band | N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, n79, n40 | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | |
| 5G NR Frequency | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500, TDD TD 4500, TDD 2300 | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, TDD TD 3700, TDD TD 3500, TDD 2300 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 5.1 | Bluetooth 5.2 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| MEDIA | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), apt-X, LDAC, MID, SBC, apt-X HD | WAV, WMA, AAC, PCM, AMR, MP3, FLAC, XMF, OGG, MIDI, APE (Monkey's Audio), M4A, DSF, DSD, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, DFF, MID, DSD64, DSD128 | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, H.264, H.265, MP4 | MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 | |
| Sound Enhancements | Hi-Res audio certified, Dirac 2.0 sound effect | Dolby Digital Plus sound, Dolby Atmos sound technology, Surround sound, stereo speakers tuned by AKG, Dolby Digital sound |
| FEATURES | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, geomagnetic sensor, gravity sensor | Accelerometer, ambient light sensor, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor | |
| Security Devices | Face recognition, fingerprint reader (side) | Fingerprint reader (under display), face recognition | |
| Additional Phone Features | Multitasking, Fast Charging, OPPO Relax | Air View, MIMO technology, Smart Select, Samsung KNOX, Smart View, Live message, Screen off memo, Bixby Vision, Dual Audio, Bixby Routines, Intelligent Performance Enhancer, AR Doodle, PENUP, Bixby key, Samsung Knox Vault, Private Share function, Enhanced Game Booster, Air Command |
| OTHERS | OPPO Reno4 Z 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Included Accessories | Headphones, power adapter, SIM card removal tool, USB-C cable, protective case | SIM card removal tool, USB-C to USB-C cable | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland Low Blue Light Certification | IP68, HAC (Hearing Aid Compatible) | |
| Max Depth of Water Resistance | - | 1.5 m |
cs
sk
de
it
es
fr
hu
pt
ru
pl
br
ro
