xvYCC for x264

[nightstalkerpoet]

Has anyone really worked with the x264 xvYCC color transfer setting? For a specific example - I am unimpressed with HDR on lower end TVs. It tends to leave a very dull picture, which is very disappointing when dropping money on UHD discs. With more UHD discs becoming available as sources, I was wondering if anyone has tried to take, lets use Harry Potter as an example, the 4k UHD, and reencode to a 1080p xvYCC bluray compatible file. That way, we get the color benefits of 10 bit without the somewhat unbalanced HDR implementations.

I ask mostly because everywhere I read says using transfer characteristics in x264 is frequently pointless.