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Galaxy S21 Ultra 5G vs 12

Samsung Galaxy S21 Ultra 5G vs Xiaomi 12

What Galaxy S21 Ultra 5G does better (16) and where 12 wins (9) — every spec side by side.

Samsung · 2021Galaxy S21 Ultra 5G

9.0Score

16 advantages≈ $260

Higher score

Xiaomi · 202112

8.8Score

9 advantages≈ $320

9.1Display7.5

6.7Performance7.4

9.8Camera9.2

6.2Battery7.2

9.4Features9.0

Dimensions

Size comparison

Galaxy S21 Ultra 5G12

	Galaxy S21 Ultra 5G	12	Difference
Height	165.1 mm	152.7 mm	+12.4 mm
Width	75.6 mm	69.9 mm	+5.7 mm
Thickness	8.9 mm	8.2 mm	+0.7 mm
Weight	227 g	179 g	+48 g

Drawn to the same scale from the official dimensions (front and side).

Why is Galaxy S21 Ultra 5G better than 12?

Main camera108 MP vs 50 MP2.2×
Optical zoom10× vs 2.1×4.8×
Storage (max)512 GB vs 256 GB2×
Battery capacity5,000 mAh vs 4,500 mAh+11%
RAM16 GB vs 12 GB+33%
Peak brightness1,500 nits vs 1,100 nits+36%
Pixel density515 ppi vs 419 ppi+23%
Rear cameras4 vs 22×
4K selfie videoYes · 12: No
eSIMYes · 12: No
Measured brightness1,023 nits vs 896 nits+14%
Screen size6.8″ vs 6.3″+8%

Why is 12 better than Galaxy S21 Ultra 5G?

Wired charging25 W vs 67 W2.7×
AnTuTu score657,150 vs 985,115+50%
Wireless charging power15 W vs 50 W3.3×
Geekbench 6 (multi-core)3,518 vs 3,652+4%
Weight227 g vs 179 g+27%
CPU frequency2.9 GHz vs 3 GHz+3%
Charged in 30 min54% vs 77%+43%
Process5 nm vs 4 nm+25%
Thickness8.9 mm vs 8.2 mm+9%

Specifications

Side by side

Only differences	Samsung Galaxy S21 Ultra 5G≈ $2609.0	Xiaomi 12≈ $3208.8
Design
Weight	227 g	179 g
Thickness	8.9 mm	8.2 mm
Height	165.1 mm	152.7 mm
Width	75.6 mm	69.9 mm
Frame	Aluminium	Aluminium
Back	Glass	Glass
Ingress protection	IP68	—
Water resistance (IPx)	IPx8	—
Glass protection	Corning Gorilla Glass Victus	Corning Gorilla Glass Victus
Colours	Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy	Gray, Blue, Purple, Green
Stylus	Yes	—
Display
Screen size	6.8″	6.3″
Panel	Dynamic AMOLED 2X	AMOLED
OLED panel	Yes	Yes
Resolution (width)	1,440 px	1,080 px
Resolution (height)	3,200 px	2,400 px
Pixel density	515 ppi	419 ppi
Refresh rate	120 Hz	120 Hz
Peak brightness	1,500 nits	1,100 nits
Measured brightness	1,023 nits	896 nits
Screen-to-body ratio	89.8%	89.2%
HDR	Yes	Yes
Performance
Chipset	Exynos 2100 - International	Qualcomm SM8450 Snapdragon 8 Gen 1
Chip maker	Qualcomm	Qualcomm
Process	5 nm	4 nm
CPU cores	8	8
CPU frequency	2.9 GHz	3 GHz
GPU	Mali-G78 MP14 - International Adreno 660 - USA/China	Adreno 730
AnTuTu score	657,150	985,115
Geekbench 6 (multi-core)	3,518	3,652
3DMark Wild Life Extreme	—	2,255
Memory
RAM	16 GB	12 GB
Storage (max)	512 GB	256 GB
Storage (base)	128 GB	128 GB
Storage type	UFS 3.1	UFS 3.1
Memory card slot	No	No
Camera
Main camera	108 MP	50 MP
Main camera aperture	f/1.8	f/1.9
Main sensor size	1/1.33"	1/1.56"
Rear cameras	4	2
Optical stabilisation	Yes	Yes
Ultra-wide camera	Yes	Yes
Telephoto camera	Yes	Yes
Optical zoom	10×	2.1×
Max video	8K	8K
4K video frame rate	60 fps	60 fps
Selfie camera	40 MP	32 MP
4K selfie video	Yes	No
Battery
Battery capacity	5,000 mAh	4,500 mAh
Battery type	Li-Ion	Li-Po
Wired charging	25 W	67 W
Charged in 30 min	54%	77%
Wireless charging	Yes	Yes
Wireless charging power	15 W	50 W
Reverse wireless charging	Yes	Yes
Connectivity
5G	Yes	Yes
eSIM	Yes	No
Dual SIM	Yes	Yes
Wi-Fi standard	Wi-Fi 6E	Wi-Fi 6E
Bluetooth	5.2	5.2
NFC	Yes	Yes
USB	USB Type-C 3.2	USB Type-C 2.0
USB version	3.2	2
Ultra Wideband	Yes	—
Infrared port	—	Yes
Dual-band GPS	—	Yes
Satellite navigation	GLONASS, GALILEO, BDS	GLONASS, GALILEO, BDS, QZSS, NavIC
Features
Stereo speakers	Yes	Yes
3.5 mm headphone jack	No	No
Loudspeaker loudness	-25.5 LUFS	-25.3 LUFS
Fingerprint sensor	Under display, ultrasonic	Under display
Barometer	Yes	—
Sensors	Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer	Fingerprint (under display, optical), accelerometer, gyro, compass
SAR (head)	0.71 W/kg	0.6 W/kg
Software
OS at launch	Android 11	Android 12
Platform	Android	Android
Interface	One UI 7	MIUI 13
Major OS updates promised	4	—