I have only covered two Pro games myself but I've done as much research as possible on the subject. That hurts to hear that as I pour a ton of effort into research but I can't be an expert on all things, obviously. Just doing the best I can within my limited space here. :-(
I can absolutely, 100% tell the difference between 59 and 60fps on a 60hz display. No tools required.
Don't mean to offend, It's just the constant guessing i.e. "I think" or "Cerny told me", and the constant bringing up of CheckerBoarding. I have watched several Vids and it's basically the same rhetoric. It's has a soft image? what the hell does that mean without a comprarison to show this soft you supposedly see.
The PS4 Pro has more to it than Soft and CheckerBoarding and the drumbeat of 60fps. Things we don't hear about in the analysis
New ID buffer for tracking triangles and objects, opening the door to advanced spatial and temporal anti-aliasing
Delta colour compression technology arrives in PS4 Pro, maximising memory bandwidth. Not seen in PS4
New features from AMD roadmap - the ability to run two FP16 operations concurrently instead of one FP32, plus the integration of a work scheduler for increased efficiency
Enhanced 16-bit half-float support
This is what I'm talking about when I say surface, it's the constant barrage of checkerboard, framerate, and we some something soft.