I've started 2 Pro enabled games, Homefront: The Revolution and Nier Automata.
Homefront is a surprisingly good looking game. I know the main concern with the OG PS4 and XB1 versions was the performance but the Pro patch seems to have completely ironed it out. Through out my first few hours, the frame rate has held remarkably well and I'm surprised at how well some of the graphical elements of the game look.
I would love to find out whether this Pro patch retains all the cut graphical effects that they needed to implement to get performance better on OG PS4 or if it's running all the original effects. I am also keeping the temporal anti aliasing from the in-game options off as to my eyes the SMAA image looks cleaner. I didn't notice any difference in performance either way though.
Homefront on Pro runs at 1440p/30 FPS with SMAA (or TAA in the in-game options as a choice).
Some screens:
Second game is Nier: Automata.
Holy shit this game is pretty awesome but also kind of a let down in terms of Pro support. OG game runs at 900p/60 and it's good that the Pro version at least offers a resolution boost at 1080p/60 and better effects, so the image quality front checks out.
However, the game uses pre rendered video files for pretty much all the cut-scenes and those are still in the same 900p/30 FPS even on a Pro so it's jarring to see the game switching from the silky smooth 1080p/60 to 900p/30 for story events.