Why s5?
Impressive camera
Better battery life then m8
Health functions along with heart rate sensor
Better screen contrast
Water resistant
Finger print sensor
Why M8
Built Quality
Simple UI
Good depth im low light pics
Why z2
Looks better then s5
Bigget screen 5.2
Bigger battery
Above 20mp camera but after camera reviews s5 still have better scores.
Personally i wont recommend sony at all.
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