Phone Comparison - Lenovo K900 vs Sony Xperia Z Ultra vs Lenovo Vibe X2
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| Manufacturer | Lenovo | Sony | Lenovo |
| Announced | January 2013 | June 2013 | September 2014 |
| Status | Available - April 2013 | Available - July 2013 | Available - October 2014 |
| Colors | Black | Black, White, Purple | White, Gold, Red, Dark Grey |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
157 x 78 x 6.9 mm (6.18 x 3.07 x 0.27 in) |
179.4 x 92.2 x 6.5 mm (7.06 x 3.63 x 0.26 in) |
140.2 x 68.6 x 7.3 mm (5.52 x 2.7 x 0.29 in) |
| Weight | 162 g (5.71 oz) | 212 g (7.48 oz) | 120 g (4.23 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - All Versions | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 2100 | HSDPA 850 / 900 / 1700 / 1900 / 2100 - All Versions | HSDPA 850 / 900 / 1700 / 1900 / 2100 |
| 4G Network | - | LTE 700 / 850 / 1700 / 1900 / 2100 / 2600 / 900 - C6806 | LTE 800 / 1800 / 2100 / 2600 |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, EMail, IM |
| Build Features | - | - IP58 Certified - Dust and Water-proof - Water Resistant up to 1 Meter and 30 Minutes |
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| OS | Android OS, v4.2 (Jelly Bean) | Android OS, v4.2 (Jelly Bean) | Android OS, v4.4 (KitKat) |
| Processor | Dual-core 2.0 GHz, Intel Atom Z2580 | Quad-core 2.2 GHz Krait 400, Qualcomm MSM8274/MSM8974 Snapdragon 800 | Octa-core 2.0 GHz, MediatTek MT6595m True8Core |
| GPU | PowerVR SGX544 | Adreno 330 | PowerVR G600 |
| RAM | 2 GB | 2 GB | 2 GB |
| Internal Memory | 16 GB | 16 GB | 32 GB |
| External Memory | microSD, up to 32 GB | microSD, up to 64 GB | No |
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| Type | IPS LCD capacitive touchscreen | Capacitive touchscreen | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.5 inches | 6.44 inches | 5.0 inches |
| Resolution | 1080 x 1920 pixels (401 ppi) | 1080 x 1920 pixels (342 ppi) | 1080 x 1920 pixels (441 ppi) |
| Screen-to-Body Ratio | 67.94% | 69.15% | 71.52% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Stereo FM radio | Stereo FM radio with RDS | - |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, autofocus | 8 MP, 3264 x 2448 pixels | 13 MP, 4160 x 3120 pixels |
| Flash | dual-LED flash | LED flash | LED flash |
| Features | Geo-tagging, Touch Focus, Face Detection | Auto focus, Geo-tagging, Touch Focus, Face Detection, Image Stabilization, HDR, Sweep Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR |
| Video | Yes, 1080p@30fps | Yes, 1080p@30fps, video stabilization, HDR | 1080p@30fps |
| Front Camera | Yes, 2 MP [Similar] | Yes, 2 MP, 1080p@30fps [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Up to 107 kbps | Yes |
| Edge | Yes | Up to 296 kbps | Yes |
| 3G | HSPA+ | HSDPA, 42 Mbps; HSUPA, 5.8 Mbps; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | HSDPA, 42 Mbps; HSUPA; LTE, Cat4, 50 Mbps UL, 150 Mbps DL |
| Bluetooth | Yes, with A2DP | Yes, v4.0 with A2DP | v4.0, A2DP |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n, dual band, Wi-Fi hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n/ac, dual band, Wi-Fi hotspot |
| USB | Yes, microUSB v2.0 | Yes, microUSB v2.0 (MHL), USB On-the-go | microUSB v2.0 |
| GPS | Yes, with A-GPS support | Yes, with A-GPS support and GLONASS | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16 GB, 2 GB RAM | 16 GB, 2 GB RAM | 32 GB, 2 GB RAM |
| Expandable Storage | microSD, up to 32 GB | microSD, up to 64 GB | No |
| USB OTG | - | Supported | - |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Li-Ion battery | Non-removable Li-Ion Battery | Non-removable Li-Po Battery |
| Capacity | 2500 mAh | 3050 mAh | 2300 mAh |
| Stand by | - | Up to 790 h (2G) Up to 820 h (3G) |
Up to 228 h (2G) Up to 216 h (3G) |
| Talk Time | - | Up to 14 h (2G) Up to 16 h (3G) |
Up to 17 h (2G) Up to 19 h (3G) |
