Detailed comparison and review of Samsung Galaxy S21 Ultra 5G and Xiaomi 12. With our comprehensive overview, you can simply compare sizes, functions, but also other key features of both phones and easily decide which one is the right choice for you. Our goal is to help you identify the main differences between products and find the phone that best fits your needs and expectations.
| DESIGN AND DIMENSIONS | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-G998B/DS | - | |
| Form Factor | Touch | Touch | |
| Height | 161.5 mm | 152.7 mm | Samsung Galaxy S21 Ultra 5G has greater height than Xiaomi 12. |
| Width | 75.6 mm | 69.9 mm | Samsung Galaxy S21 Ultra 5G has greater width than Xiaomi 12. |
| Depth | 8.9 mm | 8.16 mm | Xiaomi 12 is narrower than Samsung Galaxy S21 Ultra 5G. |
| Weight | 227 g | 180 g | Xiaomi 12 is lighter than Samsung Galaxy S21 Ultra 5G. |
| Body Colour | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | Grey | |
| Protection | Dustproof, splashproof, water-resistant | - | |
| Waterproof (Water-resistant) | Yes | - | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | IP68 | - | |
| SAR Value | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | 0.596 W/kg (head), 0.998 W/kg (body), 1.972 W/kg (limb) | |
| Connector Type | USB Type-C - 24 pin USB-C | USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM, Electronic SIM card (e-SIM) | - | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | Infinity-O Dynamic AMOLED 2X | AMOLED | |
| Screen Size (Display Size) | 6.8" | 6.28" | Samsung Galaxy S21 Ultra 5G has larger screen size than Xiaomi 12. |
| Screen Resolution (Display Resolution) | 3200 x 1440 pixels | 2400 x 1080 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than Xiaomi 12. |
| Display Format | QHD+ | Full HD+ | |
| Pixel Density | 515 ppi | 419 ppi | Samsung Galaxy S21 Ultra 5G has better pixel density than Xiaomi 12. |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 1100 cd/m² | |
| Colour Depth | 16.7 million colours | 68 billion colours | Xiaomi 12 has better colour depth than Samsung Galaxy S21 Ultra 5G. |
| Contrast Ratio | - | 5000000:1 | |
| HDR | Yes | Yes | Both phones have HDR. |
| HDR Technology | HDR10+ | HDR10+ | |
| Display Enhancement Technology | Eye Comfort Shield | Dolby Vision, Sunlight mode, AdaptiveSync technology | |
| Display Refresh Rate | 120 Hz | 120 Hz | Both phones have the same refresh rate. |
| Touch Sampling Rate | - | 480 Hz | |
| Display Features | Edge Screen, AOD(Always On Display) | Reading mode, DCI-P3 Wide colour gamut, Dot Display, True Colour, DisplayMate A+, 16000 levels auto brightness adjustment | |
| Display Protection (Screen Protector) | Corning Gorilla Glass Victus (scratch resistant glass) | Corning Gorilla Glass Victus (scratch resistant glass) |
| PROCESSOR | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Processor Type (CPU) | Samsung Exynos 2100 | Qualcomm Snapdragon 8 Gen 1 | |
|---|---|---|---|
| Clock Speed | 2.9 GHz | 3 GHz | Xiaomi 12 has higher clock speed than Samsung Galaxy S21 Ultra 5G. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G78 MP14 | Qualcomm ADRENO |
| MEMORY | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| RAM | LPDDR5 SDRAM - 12 GB | LPDDR5 SDRAM - 8 GB | Samsung Galaxy S21 Ultra 5G has more RAM than Xiaomi 12. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 256 GB | Xiaomi 12 has more internal memory than Samsung Galaxy S21 Ultra 5G. |
| User Memory | 101.7 GB | - | |
| Memory Interface | - | UFS 3.1 |
| CAMERA | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 12 Megapixel | 50 Megapixel | Xiaomi 12 has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Sensor Size | - | 1/1.56" | |
| Sensor Name | - | Sony IMX766 sensor | |
| Lens Type | Ultra wide-angle lens | Wide-angle lens | |
| Lens Aperture | F/2.2 | F/1.88 | Xiaomi 12 has better lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Lens Construction | - | 6-element | |
| Field of View (FoV) | 120 degree(s) | - | |
| Pixel Size | 1.4 μm | 1 μm | Samsung Galaxy S21 Ultra 5G has larger camera pixel size than Xiaomi 12. |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Both phones have optical image stabilization. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | Yes | - | |
| Optical Zoom | 3x | - | |
| Digital Zoom | 100x | - | |
| Self-Timer Delay | Yes | - | |
| Special Effects | Face retouch, Grid Line | Moving crowd, Neon trails, Oil painting, Light painting, Starry sky, Star trails | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | 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 | Night mode, Documents, Vlog mode, Pro Video mode, Movie frame, Night portrait mode, photo filters, Timed burst, Photo clones, Dual video mode, Ultra Night Video, Pro Time-lapse, 50MP mode | |
| Light Source | High CRI LED flash | LED flash | |
| Video Resolutions | 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 | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, 7680 x 4320 (8K) at 24 fps | |
| Camera Features (Functions) | 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 | HDR10+ recording, Google Lens, One-click AI cinema, HDR video recording, 2.1μm 4-in-1 Super Pixel, Xiaomi ProFocus |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 108 Megapixel | 13 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than Xiaomi 12. |
|---|---|---|---|
| Sensor Size (2nd Camera) | 1/1.33" | - | |
| Lens Type (2nd Camera) | Wide-angle lens | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/1.8 | F/2.4 | Samsung Galaxy S21 Ultra 5G has better second camera lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (2nd Camera) | 83 degree(s) | 123 degree(s) | Xiaomi 12 has larger second camera lens field of view than Samsung Galaxy S21 Ultra 5G. |
| Pixel Size (2nd Camera) | 0.8 μm | - | |
| Camera Features (2nd Camera) | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 10 Megapixel | 5 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than Xiaomi 12. |
|---|---|---|---|
| Lens Type (3rd Camera) | Telephoto lens | Tele-macro lens | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Field of View (3rd Camera) | 35 degree(s) | - | |
| Pixel Size (3rd Camera) | 1.22 μm | - | |
| Focal Length Equivalent to 35mm Camera | - | 50mm | |
| Camera Features (3rd Camera) | Dual Pixel AF | AF (3cm-7cm) |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 10 Megapixel | - | |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | - | |
| Lens Aperture (4th Camera) | F/4.9 | - | |
| Field of View (4th Camera) | 10 degree(s) | - | |
| Pixel Size (4th Camera) | 1.22 μm | - | |
| Camera Features (4th Camera) | Dual Pixel AF | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 40 Megapixels | 32 Megapixel | Samsung Galaxy S21 Ultra 5G has better front camera resolution than Xiaomi 12. |
| Lens Aperture (Front) | F/2.2 | F/2.45 | Samsung Galaxy S21 Ultra 5G has better front lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (Front) | 80 degree(s) | - | |
| Pixel Size (Front) | 0.7 μm | - | |
| Focus Adjustment | Automatic | - | |
| Special Effects (Front) | - | HDR | |
| Camera Modes (Front) | - | Panoramic selfies, AI Beautify, Timed burst, Selfie Night mode, Capture Dual, Time-lapse selfie, AI portrait mode with bokeh and depth control, AI portrait video | |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps | |
| Camera Features (Front) | Phase Detect Auto-Focus (PDAF) | 4-in-1 to 1.4μm Super Pixel, Video HDR |
| BATTERY AND CHARGING | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4500 mAh | Samsung Galaxy S21 Ultra 5G has larger battery capacity than Xiaomi 12. |
|---|---|---|---|
| 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) | - | 39 min | |
| Wireless Charging | Yes | Yes | Both phones 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 |
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| CELLULAR | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | Android 11 | Android 12 | |
| User Interface | - | MIUI 13 | |
| Intelligent Assistant | Bixby | - | |
| Payment Technology | Samsung Pay | Google Pay | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou, Galileo, NavIC |
| COMMUNICATIONS | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Data Transmission | 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 8 | Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 800, 900, 800 | |
| 4G LTE Band | 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 | 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 42, Band 48, 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 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 | 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, TDD 3500, TDD 3600, FDD 1700 - 2110 AWS-3 | |
| 5G NR Band | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n79, n40 | |
| 5G NR Frequency | 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 | 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 TD 4500, TDD 2300 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac/ax | IEEE 802.11a/b/g/n/ac/ax, Wi-Fi 6E | |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.2 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| MEDIA | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Supported Digital Audio Standards | 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, M4V, WebM, 3G2, MP4 | - | |
| Sound Enhancements | Dolby Digital Plus sound, Dolby Atmos sound technology, Surround sound, stereo speakers tuned by AKG, Dolby Digital sound | Harman Kardon Sound technology, Dolby Atmos sound technology |
| FEATURES | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor | Accelerometer, ambient light sensor, proximity sensor, digital compass, flicker sensor, gyroscope, 360° ambient light sensor | |
| Security Devices | Fingerprint reader (under display), face recognition | Fingerprint reader (under display) | |
| Security Technology | - | AI face unlock | |
| Additional Phone Features | 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 | MIMO technology, linear motor, VC Liquid Cooling, Reverse wireless charging, dual stereo speakers, X-axis linear vibration motor, IR blaster, Qualcomm 7th generation AI Engine, Xiaomi AdaptiveCharge |
| OTHERS | Samsung Galaxy S21 Ultra 5G | Xiaomi 12 |
|---|
| Included Accessories | SIM card removal tool, USB-C to USB-C cable | SIM card removal tool, USB-C cable, protective case, 67W charger | |
|---|---|---|---|
| Compliant Standards | IP68, HAC (Hearing Aid Compatible) | SGS Low Blue Light Certification | |
| Max Depth of Water Resistance | 1.5 m | - |
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