37 not "low"
The Samsung H8000 Series is low compared to an average 4K TV with like 80+ ms of input lag and under 40ms of lag is very playable from my research. I doubt most players will notice the 36ms lag (I have the 55" which is one lower, 65" is 37ms) of the Samsung vs the 24ms of the Sony W850B. The Samsung is not pro level for tournents, for that you would need under 20ms of lag. Or better yet a near zero lag PC Display.
I plan on a PC Display as a companion for my serious Fighter or FPS moments, if I ever have them. While it would have been nice to go with the 24ms lag of the Sony W850B, there are too many reports of recent radial banding and the 3D is horrible / pointless on that TV. The Samsung has great 3D and smart functions so it is the better overal option IMHO.
Sony's W950B has 17ms of lag but lacks a good contrast ratio (along with poor 3D as well) and was poorly received this year in the reviews. This is due to a LG IPS panel this year as the Sony W900 last year was leagues better. I get a general sense of budget cuts with Sony's lineup this year, I think their TV division and which panels they use is in transition.
LG's 2014 TVs again mostly use IPS which have mid to high 20's lag, good viewing angles, good 3D, good colors, good smart functions, but with a far inferior contrast ratio. Some say contrast ratio is by far the most important measure for picture quality. I had a 47" IPS LG one time, Batman Begins on Blu-Ray was over taxing its contrast ratio for sure.
Sony is still my go to brand for projectors with the HW40ES which has mid 20's ms of input lag. Nothing touches the Sony for the money on projectors. Of course projectors despite handily beating LCSs on picture quality are more fussy to setup, need ambient light control, use up replaceable yet expensive bulbs over the years, and needs an expensive screen to look the best.
In the end my research did not find the perfect 2014 HDTV, just which compromise you can live with. For great picture quality, Blu-Ray, 3D Blu-Ray, good smart TV functions, non tournament gaming use, and just an overall well rounded TV, get the Samsung UN55H8000. For serious pro tournament level gaming get a super low lag PC monitor. The closest thing to the best of both worlds is the Sony HW40ES projector with mid 20's ms input lag and a killer picture. Sadly the Sony HW40ES was not available at the store I wanted to use the no interest deal at.