I agree with @Maddox, it is great with my Samsung 1080p plasma, when configured properly.
Yes get the 4K. For all the points raised earlier. The muted colour issue is mainly dependant upon your TV. I had a 6 series (ie cheap) Samsung 4K and the issue was really a problem. I now have an LG 2017 OLED and it is not a problem at all. I just leave the TV in Dolby Vision and don’t even bother with colour depth switching.