I own both the 75" Q8FN and the 75" X900F. I have to respectfully disagree with the reviewers. Believe me, there is way more than a 0.1 point increase in real world performance of the Q8FN over the X900F. The X900F is a Bloom Monster in a dark room. If you watch anything with captions, expect your viewing experience to be ruined. The blooming on the Q8FN is so subtle that, in most cases, you’ll never notice it. The Q8FN has far better blacks, IMO, because they aren’t ruined by obnoxious highlight blooming, as they are on the X900F.
The Q8FN has better color reproduction, better contrast, better real world brightness, better operating system (by far), better menu system, better upscaling, better (far brighter and contrastier) HDR performance, better motion control and far better streaming of HDR content. Try watching the Peru in 8K HDR video on YouTube on the X900F and you’ll get motion sickness from all of the frame dropouts (Judder?), then watch it on the Q8FN, where it plays the video back silky smooth. I almost forgot to mention how much better gameplay is on the Q8FN. No comparison, at all. The Sony makes me look like a noob while racing. The Q8FN makes me look like a pro!
Sorry, there is absolutely no comparison. If you buy the Sony, eventually, you’ll come to regret it. IMO, the Q8FN receives the crown as the best overall value in high-end LED 4K TV’s. It perfectly hits the sweet-spot between price and performance. Regards.