Two of the Samsung flagships that came out four years after one other include the Samsung Galaxy S25 Ultra, released in 2025, and as far back as 2021, there was the Samsung Galaxy S21 Ultra. These are top-class in their generations but show drastic differences between each other in regards to design upgrade, performance upgrade, camera upgrade, and upgrade on battery life in the Samsung S25 Ultra.
It has a slightly more compact and refined body with lighter weight than the S21 Ultra. Added also is the Gorilla Glass Armor that will be used to give strength for more protection. Its display remains one of its selling points, where the S25 Ultra uses Dynamic LTPO AMOLED 2X. The panel can now go as bright as 2600 nits, far more than the 1500 nits the S21 Ultra could only achieve.
Performance-wise, the S25 Ultra packs the Qualcomm Snapdragon 8 Elite (3nm) chipset, making it a much better device when it comes to processing power and efficiency as compared to the Exynos 2100 (5nm) used in the S21 Ultra. The new model has Android 15 with One UI 7 running on it. This promises that the device runs much smoother with longer software support. It possesses the Adreno 830 GPU, which, in comparison with the Mali-G78 MP14 GPU on S21 Ultra, makes the performance of gaming much better and better graphics rendering. The camera system of the S25 Ultra is significantly upgraded to contain a 200 MP main sensor, compared to 108 MP for the S21 Ultra.
A new 50 MP periscope telephoto lens also comes with 5x optical zoom so that shots taken from farther away will be sharper, and the upgraded ultrawide and secondary telephoto lenses all round make photography more enjoyable. S25 Ultra continues to take computation photography to the next level through AI. Its low-light and HDR images now surpass those produced by the S21 Ultra. Battery life of S25 Ultra is the same 5000 mAh that S21 Ultra has but power management is far more effective in this model. This gives much longer hours in a single charge. Wired and wireless charging also happen faster; thus, these users can enjoy faster top-ups. Overall, the Samsung Galaxy S25 Ultra is a major upgrade from the S21 Ultra, with a brighter display, better performance, a more capable camera system, and improved battery efficiency. The S21 Ultra is still a powerful device, but the S25 Ultra is the latest and best that Samsung has to offer in 2025.
| Fture | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G | GSM / CDMA / HSPA / EVDO / LTE / 5G |
| SIM | Nano-SIM + eSIM or eSIM + eSIM or Nano-SIM + Nano-SIM + eSIM (max 2 at a time) | Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM and/or eSIM, dual stand-by) |
| Feate | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Announced | January 1, 2025 | January 14, 2021 |
| Status | Available | Available |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Dimensions | 162.8 x 77.6 x 8.2 mm | 165.1 x 75.6 x 8.9 mm |
| Weight | 218 g | 227 g (Sub6), 229 g (mmWave) |
| Build | Glass front (Gorilla Glass Armor), aluminum frame, glass back | Glass front (Gorilla Glass Victus), aluminum frame, glass back |
| Colors | TitaniumSilverBlue, TitaniumBlack, TitaniumWhiteSilver, TitaniumGray, TitaniumJadeGreen, TitaniumJetBlack, TitaniumPinkGold | PhantomBlack, PhantomSilver, PhantomTitanium, PhantomNavy, PhantomBrown, Navy |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Type | Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak) | Dynamic AMOLED 2X, 120Hz, HDR10+, 1500 nits (peak) |
| Size | 6.9 inches, 116.9 cm² (~92.5% screen-to-body ratio) | 6.8 inches, 112.1 cm² (~89.8% screen-to-body ratio) |
| Resolution | 1440 x 3120 pixels, 19.5:9 ratio (~498 ppi density) | 1440 x 3200 pixels, 20:9 ratio (~515 ppi density) |
| Protection | Corning Gorilla Armor 2 | Corning Gorilla Glass Victus |
| Features | Always-on display | Always-on display |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| OS | Android 15, One UI 7 | Android 11, upgradable to Android 14, One UI 6 |
| Chipset | Qualcomm Snapdragon 8 Elite (3 nm) | Exynos 2100 (5 nm) |
| CPU | Octa-core (2×4.47 GHz Oryon V2 Phoenix L + 6×3.53 GHz Oryon V2 Phoenix M) | Octa-core (1×2.9 GHz Cortex-X1 & 3×2.80 GHz Cortex-A78 & 4×2.2 GHz Cortex-A55) |
| GPU | Adreno 830 | Mali-G78 MP14 |
| Feature | laxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Internal | 256GB 12GB RAM, 512GB 12GB RAM, 1TB 12GB RAM | 128GB 12GB RAM, 256GB 12GB RAM, 512GB 12GB RAM |
| Card Slot | No | No |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Main | 200 MP, f/1.7, 24mm (wide), multi-directional PDAF, OIS | 108 MP, f/1.8, 24mm (wide), PDAF, Laser AF, OIS |
| Telephoto | 10 MP, f/2.4, 67mm, PDAF, OIS, 3x optical zoom | 10 MP, f/4.9, 240mm, dual pixel PDAF, OIS, 10x optical zoom |
| Periscope | 50 MP, f/3.4, 111mm, PDAF, OIS, 5x optical zoom | 10 MP, f/2.4, 72mm, dual pixel PDAF, OIS, 3x optical zoom |
| Ultrawide | 50 MP, f/1.9, 120˚, dual pixel PDAF, Super Steady video | 12 MP, f/2.2, 13mm, dual pixel PDAF, Super Steady video |
| Features | Laser AF, Best Face, LED flash, auto-HDR, panorama | LED flash, auto-HDR, panorama |
| Video | 8K@24/30fps, 4K@30/60/120fps, 1080p@30/60/240fps, HDR10+, stereo sound rec., gyro-EIS | 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Single | 12 MP, f/2.2, 26mm (wide), dual pixel PDAF | 40 MP, f/2.2, 26mm (wide), PDAF |
| Features | HDR, HDR10+ | Dual video call, Auto-HDR |
| Video | 4K@30/60fps, 1080p@30fps | 4K@30/60fps, 1080p@30fps |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Loudspeaker | Yes, with stereo speakers | Yes, with stereo speakers |
| 3.5mm Jack | No | No |
| Audio | 32-bit/384kHz audio, Tuned by AKG | 32-bit/384kHz audio, Tuned by AKG |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct |
| Bluetooth | 5.4, A2DP, LE | 5.2, A2DP, LE |
| Positioning | GPS, GLONASS, BDS, GALILEO, QZSS | GPS, GLONASS, BDS, GALILEO |
| NFC | Yes | Yes |
| Radio | No | No |
| USB | USB Type-C 3.2, DisplayPort 1.2, OTG | USB Type-C 3.2, OTG |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Sensors | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Type | Li-Ion 5000 mAh, non-removable | Li-Po 5000 mAh, non-removable |
| Charging | Fast charging 45W, Wireless charging 25W (Qi2), Reverse wireless charging 4.5W | Fast charging 25W, Wireless charging (Qi/PMA) 15W, Reverse charging 4.5W |
| Feature | Galaxy S25 Ultra | Galaxy S21 Ultra |
|---|---|---|
| Colors | TitaniumSilverBlue, TitaniumBlack, TitaniumWhiteSilver, TitaniumGray, TitaniumJadeGreen, TitaniumJetBlack, TitaniumPinkGold | PhantomBlack, PhantomSilver, PhantomTitanium, PhantomNavy, PhantomBrown, Navy |
| Price | $1,299 | $1,199 |
Price Comparison of Samsung Galaxy S25 Ultra and S21 Ultra Across Various Countries
| Cntry | Galaxy S25 Ultra Price | Galaxy S21 Ultra Price |
|---|---|---|
| Pakistan | PKR 299,999 | PKR 219,999 |
| Iceland | ISK 179,999 | ISK 149,999 |
| Australia | AUD 2,149 | AUD 1,849 |
| Austria | €1,299 | €1,199 |
| Belgium | €1,299 | €1,199 |
| Canada | CAD 1,918.99 | CAD 1,649 |
| Finland | €1,299 | €1,199 |
| Germany | €1,299 | €1,199 |
| Nauru | AUD 2,149 | AUD 1,849 |
| New Zealand | NZD 2,399 | NZD 2,099 |
| Singapore | SGD 1,828 | SGD 1,598 |
| South Africa | ZAR 24,999 | ZAR 21,999 |
| Switzerland | CHF 1,399 | CHF 1,299 |
| United Arab Emirates | AED 5,099 | AED 4,499 |
| United Kingdom | £1,249 | £1,149 |
| United States | $1,299.99 | $1,199.99 |
| Vatican City | €1,299 | €1,199 |
| India | ₹129,999 | ₹105,999 |
| Kuwait | KWD 399 | KWD 349 |
| Malaysia | MYR 5,299 | MYR 4,999 |
| Nepal | NPR 159,999 | NPR 139,999 |
| Philippines | PHP 72,990 | PHP 59,990 |
| Qatar | QAR 4,749 | QAR 4,199 |
| Saudi Arabia | SAR 4,999 | SAR 4,499 |
| Russia | RUB 109,999 | RUB 99,999 |
| Thailand | THB 39,900 | THB 33,900 |
| Netherlands | €1,299 | €1,199 |
| Denmark | DKK 9,999 | DKK 8,999 |
| Norway | NOK 12,999 | NOK 11,999 |
| Sweden | SEK 13,999 | SEK 12,999 |
| France | €1,299 | €1,199 |
| Japan | ¥149,999 | ¥129,999 |
| South Korea | ₩1,808,208 | ₩1,499,000 |
| Italy | €1,299 | €1,199 |
| Spain | €1,299 | €1,199 |
| Ireland | €1,299 | €1,199 |
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