The first batch of 4k displays only allowed for 24fps at full resolution. When HDMI 2.0 becomes available it will allow for up to 60 fps at 4k. But there's nothing else special about any of the UHD stuff that allows for better motion than that.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris