Had a little time to play on the Pro, fired up Bloodborne with the PS4 enhancements enabled, does look a little sharper but didn't really notice a lot else. Next fired up Horizon Forbidden West using the Performance Pro (think that's the one....), I mean the game already looked good but damn at 60fps it looks good and feels even better. Also tried Spiderman Remastered with the recommended Performance Pro mode and enabled the 120Hz display mode, again game looks amazing and feels so smooth to zipping around the city.
Had my TV on mute as well, couldn't hear the fan in my console sitting around 1.5-2m away from it but it was only on for 30-40mins so probably not had time to get up to temp.
Pro might be £700 but for me totally worth it with the extra smoothness it brings, shame it doesn't seem all games can be run at 60fps but I'll take what I can get.