By the time Hdmi 2.2 is norm. It will be obsolete just go for the cheapest highest resolution you can get with the higher frame rate. By the time you calibrate it UHD is just a lot brighter. Unless its a projector size the 4k UHD details are slightly sharper and brighter.
Though all the stuff over on H.T.S. say the band width isn't up to par {only 10 or 15 Mbps}so far.
Though THEATER SHACK seems almost paid to promote a lot of products.