I have tried playing the UHD Bluray Remux video via Safari on the latest MacOS(Big Sur), it worked well, the color of the picture looked close to the SONY TV.
But, if I switch to Plex for Mac, the color is different from the output of Safari Browser, the skin tone of actor is much more yellow. I guess that Plex for Mac is not handling HDR correctly. may be inaccurate tone mapping?
Is there a road map to support HDR on Big Sur?