1) Overall design, 6.2" curve screen n night shoot s8+ win
2) 4k HDR for gaming, day camera n others performance xzs premium win
The only thing will "make" me choose XZP is 4k display and 960fps slowmo.
Cam wise, unless pixel to pixel, else you won't have noticeable difference. Especially when you upload to FB, Whatsapp.
Well, my fren bought XZP with pre-order promo. Quite nice phone. I did own Xperia Z, Z1. Skip the rest of the Z series until Z5P which tempted but at the end go for V10 which fail on me recently.