4k =/= HDR/Dolby Vision. So Disney+ is Dolby Vision/HDR, Amazon Prime has a ton of HDR content like Jack Ryan. Totally different beast than regular 4k.
Honestly, I was wrestling with the same decision you were at. 65 C9 for 2k or 75 TCL for 1300. Went the bigger route and super happy with it. Side by side with OLED it wouldn't look nearly as good but I'm really happy with it, used the rtings site and a youtube RGB pattern to set the picture. Football and hockey both look great, no blurring or washed out ice.