When you think about Water resistant smart phone from Sony firstly one name come to your mind is that Sony Xperia M4 Aqua. It looks near about Xperia Z3. Nice looking phone. Good display with 5 inch 720 p IPS scratch resistant display. But the viewing angle is little bit lower. Performance is little lags even though it has Snapdragon 615 octa core processor. The phone is slippery. But 5 inch phone, you can hold comfortably. The phone has 13 mp back camera but the performance is not good even specially night still image is over saturated and image is not clear and has so much noise. But the 5 mp front camera is nice enough. Video quality is good of both cameras. Sound quality is also good with walkman player. The best things is that it is water resistant. You can capture under water. Performance little lags and sometimes hangs. The battery backup is not good. There is also have heating issue. Thanks to all.