What's the difference between Sony z3+ and z5?

Z5 has fast focusing speed, more stable white balance and better camera than z3.

But in reality, it won't be any different. The improvement during the day is very small, and the night scene is obvious.

Forget buying the z5 for the camera, especially if you have the z3, you will probably be disappointed. I don't think it's as good as s6edge.