Samsung Galaxy S6
By your needs I see it as a clear winner.
Fastest camera, great low light performance, 16MP but by my experience photos are clearer and full of information.
You can check the photo samples by yourself anyways :)
The best Amoled display with QuadHD, Ppi that with rock your view. Samsung is the King of Amoled.
And don't let "privacy" scare you, it's nonsense. No one cares about your personal stuff. For example I actually get useful ads on Facebook for that reason. And yes its better experience with Google Now and it's suggestions on places and things.
Malware? Hard to get it if you install legit apps and use logic. I however never experienced any of this. Antivirus is there just for fun. No worries here.
I would however suggest A LG G4 if price matters and size doesn't.
It has an QuadHD IPS display (Actually may be better at viewing photos and natural colors) and a lower 1.8 aperture for even lighter photos in low light conditions. And a way bigger battery.
http://www.amongtech.com/10-photos-taken-using-lg-g4/