I have to be doing something wrong. A setting on my Apple TV or even my actual TV must be off. Something.

Watching the Optimum TV app through my 4K Apple TV since getting my new Sony X90L. Connected through a top of the line HDMI cord (there is no ethernet cable slot) I have the picture setting to 4K SDR. Frame rate match is turned "on" while Dynamic range is "off", though I've messed around with on and off with both of these settings and it hasn't really changed anything I can see.

To put this all in simple words... the picture is, well, not perfect. I say this because for example I'm watching NCAA basketball on TBS and while the picture appears good, I go to the TBS app and watch "Live TV" and boom, its crisper, brighter, colors pop more, more details on the players, etc. The way I envisioned the television would be. Then I go back to the game on the Optimum app and the downgrade becomes easily apparent, as it is a picture that just comes off a bit duller and less sharp. When seeing the full court camera the players faces almost appear slightly pixelated, with the only shots coming close to that super crisp HD being when the closer camera comes on the players, but still even that is nothing like if you were watching through the app. Matter of fact, during the post game on court one on one interviews, the interviewers and players look very soft.

So what is happening here? Is there some sort of setting I am missing? Or is this just Optimum's picture vs the apps?

Other notes about my settings: My Chroma is at 4:4:4 and not 4:2:0 and my HDMI output is YCbCR. When I changed the latter to RGB High it made the picture worse.