4K HDR TV just arrived today, Finally all setup and everything.
The Horizon Zero Dawn video on youtube in 4k without HDR already looks noticeably better than what I was seeing via the gamersyde video on my old 1080p TV.
Also, my GTX 770 is struggling with 4k resolution LOL. Showing white specks here and there when running at that resolution, very noticeable on still images. Knew it wasn't good enough for gaming, but didn't expect it to struggle with just the OS function and video playback. May actually push me to upgrade my GPU soon (still good on the CPU and RAM front though so it'll only be the GPU that gets upgraded).
Can't wait till Pro. I hope the media player on the Pro can play 4k HDR files. Would be nice. Only HDR source I have at the moment is the Xbox One S (which is not working properly with this TV at the moment, a firmware update for the TV is coming next month to fix that), and Netflix with a few titles here and there.