The ks8000 is PERFECT for the One X. Actually, my budget was $2000 last Dec for a new TV. I narrowed my options down to either the ks8000-65 or LGuh8500-65, both did 4k HDR-10, Dolby Vision, ect, with all the bells and whistles needed for gaming, with the ks8000 having a slightly better (and brighter) picture.
In the end i ended up going with the LG, only because i have a huge collection of 3D movies and the LGuh8500 2016 model was the last TV rolling out that supported 3D. Honestly if not for the 3D i would have went with the ks8000, but non the less still love my LG and am very happy with it for gaming. My cousin went with the ks8000-65 literally the same week i got mine, and boy do the colors pop on that thing!!!
If you got the budget for a good gaming TV, you can't get any better then the ks8000 with a budget say of $1800 or below.