If you've got $15,000 burning a hole in your pocket then you could look at pre-ordering Samsung's massive 85-inch 8K TV. The new 85-inch Q900 is up for pre-order before it begins shipping to customers on October 28.
There isn't much native 8K content but 4K content will look just as good on the huge 8K TV, while there are some videos on YouTube that stream in their native 7680x4320 resolution they're few and far between. In my personal testing of NVIDIA's new GeForce RTX 2080 Ti graphics cards in NVLink, it is enough to drive games at 8K 60FPS if you drop a couple of the visual details down. I'm having no issues hitting 50FPS average with two of them in NVLink in games like Shadow of the Tomb Raider.
Still, if you want one of the best TVs on the market... you know where to sign your life away.