This is an awesome phone. Used it for a week and came up with the following details.
Battery last easily about 1.5 days with more than medium usage(1 hour of gaming, 3G, Regular calls, PDF reading, Wi fi for 3-5 hours).
Camera quality is best among all the smart phones out there(except lumia 925/920 & 1020). It’s even better than Xperia Z1 which has 20MP cam.
Performance - It’s flawless, Blessed with new snapdragon 800 processor. This phone has topped almost all the benchmarks.
Screen - one word - "PERFECT", It has got a screen size of 5.2 inch. In a body of size smaller than that of Xperia z1(which has 5 inch display). Also it is IPS display, so very bright. Very comfortable even in Sun light.
Only place where it lags behind(not by big margin though) is it’s plastic back cover. Though it is durable but it feels little cheap. But again, Most people put cover over such a premium phone. So it doesn’t really matter much.
Any one thinking to buy a premium smart phone. I’ll suugest you to buy this phone as it has awesome specs and performance is awesome.