Picked up a Pro at the weekend in preparation for Death Stranding 2. Only tried a few games so far - Callisto Protocol (40fps mode looks fantastic), Spider Man Remastered (PSSR mode seems to be quality at 60+ fps? Nice) and Dragons Dogma 2 (Looks and runs better, around or above 60. There's some weird artefacts around character when panning camera quick near water but Balanced PSSR has been fine otherwise). Warframe surprisingly has PSSR too so you can max out all the graphics settings with it on quality. Looking forward to trying out some others when I get the chance.
The one thing haven't seen people talk much of is the PS4 upscaling option. Only works for 1080p PS4 games I think, but it can be pretty noticeable. Something like The Order 1886 its subtle (no surprise given the heavy post processing), but it was transformative on Dynasty Warriors 8XLCE ( I have newer DW games but this one lets me share the save with Vita) with a much sharper image compared to base PS5. Anyone have other recommendations for games that show a noticeable improvement?