Sony’s Z5 premium is really the best mobile as of now in the market. It comes with an awesome stunning design having 23mp rear and 5mp front camera.its RAM is 3gb which is really extraordinary.its the only mobile which can record 4k videos as well as display them.when compared to that of samsung s7, s7edge z5 has better camera quality.but s7 can enhance pictures very well.similarly motorola nexus 6 is in the track with good camera and picture detail.but recording 4k video means draining out battery power but it is not a major problem with z5 as it has very powerful battery power.more over that it is water resistant and has a finger print sensor to the power button.i can definitely recommend z5 for you but yeah it is a little bit expensive!