Okay, I got my pro a few hours ago and so far I've been able to download enough patches to test a few games on it, so I'll give my impression of them here (note: I only have a 1080p TV):
Rise of the Tomb Raider: The difference is remarkable. I highly suggest playing on high framerate mode, and then switching over to the high res or enhanced graphics mode to see how the game appear to play in slow motion. In any mode, however, there is a clear bump to the image quality and the game plays much better in the high framerate mode.
Call of Duty Infinite Warfare: The image quality has received a noticeable boost. The game already looked quite clean to begin with, but now it verges on pristine, especially after I switch off the film grain.
World of Final Fantasy: There is clearly a glitch with this game's pro mode, as instead of downsampling it actually displays at a lower res on a 1080p tv. There is clearly something wrong here and hopefully SE fixes it soon.
Bound: A beautiful game to begin with, it looks even more pristine now.
I have Ratchet, Shadow of Mordor, Uncharted 4, Titanfall 2 and Infamous Fight Light installing, but considering some of them are digital it could take a while before I give any impressions of them. From the other games, I would expect a much cleaner image and a smoother gameplay experience for those with 1080p tvs, with the occasional game, like Tomb Raider (and hopefully FFXV!), providing a transformative experience.
The system itself looks quite nice and seems a bit glossier than the OG ps4. The UI seems a bit faster as well. I can't really say anything about the system's noise level as I tend to have fans on in the rooms where I play, which drown out the system. The disc loading sound does sound similar to the other ps4s, but the system feels quite a bit cooler as it plays (as in, to the touch).
