Here is a good list of Ultra HD Premium Certified tv's, in a nutshell these tv's meet a standard for brightness etc that will get the best result for HDR. 4k is relatively minor contributor to overall picture quality, HDR and color gamut is where it is at. Please note there is no better substitute for picture quality than one of these tv's paired with a UHD Bluray player.
http://www.avsforum.com/forum/286-la...l#post41714961