The naysayers haven't experienced it, nuff said. Display Port 1.3 has enough bandwidth to push 4k @ 120Hz so that's sufficient. I moved from my workstation NEC to my Samsung TV because I can OC it to 120 for gaming. Makes a big difference. It's sort of like Gsync, nobody will understand until they can personally experience it.
Lol I love how that TV advertises REAL 240Hz yet it's still 60. The delay is pretty much just from image processing.
I use eVGA pixel OC to force 120Hz on my TV. It's a 40" Samsung 5 series.