5.9 on the s7 edge and 6.2 on the 8+.
I've just looked at the s7 edge with the 8+ and there's nothing in it really.
Maybe I'll just go for a 7+ instead.
That's one of the issues I have with my iPhone 7 i.e. it's just that bit to small when compared to my S7 (plus poor battery life) and I find the 7+ just that bit to unwieldy in the hand to use comfortably. That's why I like my S7 so much, it's what I call the Goldilocks effect i.e. 'just right', plus the screen on my S7 is way better than my iPhone 7.