So I got my C2 last night and boy is this a whole new experience! Truly experiencing 4k HDR for the first time in my home is just wonderful, the color, true black and brightness spectrum is just amazing. Yes I'm many many years behind but didn't want to get a cheapo set.
I currently have everything going through my Nvidia Shield 2019, which is working great. Apart from Kodi which unfortunately doesn't work with DV profiles yet with source files in MKV, but HDR10 fallback works fine. New version of Kodi coming with support for DV within MKV containers. Netflix, Prime, Paramount etc. all working great with DV and HDR10 support at 4k. Tried a few shows/movies I've watched recently and it's amazing even on a normal contemporary show the difference it makes in color spectrum. It's really going to be hard to go back from this, now I want HDR for my PC monitor.
Also have my PC connected to it from my 3090 via a 24' fiber optic HDMI 2.1 cable at 4k120Hz, and that is working very well, mostly. It's nice to be able to drag YouTube windows to the TV and have them display full HDR (since Shield YouTube won't ever support VP9 and thus can't do HDR). I've been playing with Cyberpunk 2077 in 4K RT HDR (wow!), which switches perfectly between displays. A few other titles work great switching displays, however for example Little Nightmares II switches ok, but you can't select a 4k resolution, it takes the resolutions from the main display only. You have to set the TV to the "Main display" in Windows then launch LMII before it will do 4k properly.