[RockerC]

Thats not what you said at first. You changed your post,but I understand what your saying now.

Point is that if you go out a buy a new UHD Alliance certified "Ultra HD" television and get Rec. 2020 HDR content for it, then the older S905 can not output that in its full color space.

I don't have a UHD Alliance certified "Ultra HD" television myself and will probabably not get one for a couple of years, but if I had one today then I would want to get video player hardware with the newer S905X SoC instead the older S905 if that was an option.

For ~$40 the ODROID-C2 will still be great value for the money, however I would still save up to buy a Nvidia Shield TV instead if I had bought a new UHD Alliance certified "Ultra HD" television, as I read that the Nvidia Shield TV firmware will be upgraded to support all that.