The differences from the Z1 are:
1. The Z2 is longer, slightly narrower and shallower and the Aluminiurahmen goes smoothly and continuously (so that better developed than Samsung Galaxy S5) in the glass surface over
2. It is 6 grams lighter
3. The black border around the screen is narrow
4. The corners are more rounded
5. But the most important and most significant difference is in the speakers, they are now at the front of the sides, which greatly improves sound quality
6. The display is 5.2 inches with 0.2 inches taller
>>> Pro
1. waterproof and wertigeres mineral glass enclosures
2. the Z2 includes LTE Cat 4, WLAN ac, NFC, microSD slot
3. The display is sharp and bright when viewed from the side
4. the smartphone has strong battery life (3200 mAh), so you can call 10:37 h and 8:21 surfing at full screen brightness
5. In addition, very good sound with Headset
6. The camera has a good 20-megapixel
7. The mobile phone has Android 4.4 with Sony UI
8. Sensors: acceleration, gyro, proximity, ambient light, compass, barometer, pedometer
9. microSD card slot (128 GB), 16 GB of internal memory
10. There are front-Sterolautsprecher
11. The music player is equipped with several equalizer presets and sound profiles
12. the supplied ear headphones provide a good sound
13. The pictures are stitched through the 16 million colors sharp
>>> Contra
1. Camera resolution is reduced in many modes to 8 MP
2. The smartphone has a permanently installed battery
3. It is very hot in 4K video recordings
4. The radiation value is 0.71 watts, which is more than the Galaxy S5 (0.56 W / kg) or the HTC One M8 (0.42 W / kg)
5. by the size and the edges it does in your pocket quickly hurt
6. by glass display it reflects strongly
7. Despite the Snapdragon 801 with 2.3 GHz clock and 3 GB of RAM there are sometimes small delays
>>> Conclusion This smartphone can be compared in any case with the HTC One M8 or Samsung Galaxy S5, because it's just as well, but compared with the previous Z1 there is little innovation. Why would a good alternative (who does not want to spend so much money) Sony Xperia Z1.