A relative has the UE49KS7000 which has the 10 bit panel and the QLED backlight and with decent bitrate content the IQ,is pretty amazing,and even the built in speakers were not too bad either.
Edit!!
Even DF,said it was great for gaming:
http://www.eurogamer.net/articles/digitalfoundry-2016-samsung-ks7000-4k-tv-review
Couple of days after I’d placed my order with richer sounds another retailer(Hughes direct if I call) had the 49mu7000 for £130 more than I paid for the mu6400, I did think about asking richer sounds if I can change my order but decided against it.