trashaccount thank you for the info anyway it's good to know. the pro versions are planned as gifts for people who prefer large devices. camera's benefits are not important.
for myself even p5 screen was enough and it is crucial to have a one hand usable device, it really bothers me if i need to occupy both hands where it is totally avoidable.
i think i'll just go for p8 and p8pro.
i appeciate everybody's responses!