Not wanting to piss on your buy, but there is a very good chance of the TV you bought being bad or you sitting to far.
Mine is 65" and I sit 5ft away from it so I can see the difference. Even on PS4pro that is checkerboard (but unfortunately not many games offer it), GoW I thought didn't had much difference (on FF XV when turning on and off I couldn't see much difference so I stuck to performance mode, because on high resolution sometimes performance dips were a problem on the play) but then when I put on a 1080p screen I saw a very big difference (so perhaps my TV upscaler is quite competent and mask some of the difference when I chose to have 1080p on the content).
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
Azzanation: "PS5 wouldn't sold out at launch without scalpers."