Maybe it's my old eyes but I bought a Pro on launch. Before launch, actually. And just before my Pro arrived, I bought a 4k TV. Do the games look better? Yes. But at the same time, it might be the TV. It might be a placebo effect.
In my game room, connected to a Sony XBR49800XD (Bravia) are a PS3, PS4 Pro, PSVR, Xbox 360, an Xbox One with Kinect (soon to be an Xbox One S when it arrives from Amazon), and a WiiU.
In my living room connected to a 1080p Vizio LED are and Xbox One with Kinect and an original PS4.
I go between both rooms, often playing the exact same games, on a regular basis. There's a lot of money invested in my gaming setup because I'm fucking insane with no sense of the value of the dollar. I can't, with a clear conscience, encourage somebody or make them feel jealous because the improvement the Pro offers is there but it's not THAT BIG.
I have inFamous SS, inFamous First Light, Ratchet and Clank, RotTR, Bound, TloU, Uncharted 4 a few VR games, and some other games I'm definitely forgetting. I had an image in head of what the Pro would look like and, to be honest, the games just look like PS4 games. Even with RotTR, I spent an hour jumping from mode to mode trying to spot the differences. You really have to look to see them. It's not night and day.
