You'd be better off buying a TCL 8 Series 65", or a TCL 6 Series 75" from last year. Both will perform better than that Samsung and both also have Dolby Vision. The 8 Series has considerably better local dimming (and the most dimming zones at that size) but the one on the 6 Series is not bad at all (and still definitely better than that Samsung's; even the 65" 6 Series will give you better quality). Both are also around the same price or cheaper than that Samsung.
Display: ISF Pro Calibrated LG OLED65C7P TV 7.1.4 Sound: Denon AVR-X4400H, Sony Stereo (amp), Klipsch: RP-440C, RP-250F x 2, RP-150M x 4, RP-140SA x 4, R-10SW 4K Disc Players: Oppo UDP-203 (Region Free & Dolby Vision), Panasonic DP-UB820 Streaming Player: Apple TV 4K Video-Game Consoles: Xbox One X & PS4 Remotes: Logitech Harmony Elite Remote Control with Hub and iPad App