I will also add that I humorously didn't know my TV had HDR until testing out the settings in Shadow of the Tomb Raider. I knew it was 4K, but that just goes to show how observant I am. Flipping it on and off, I wasn't really very impressed with the difference. It IS noticeable that the colors are better, but it wasn't a very big difference. I was a lot more impressed with OLED screens I've seen. It all looks fine to me even in 1080p mode. I guess I'm a terrible graphics whore. Sorry guys. I've let you all down.
One of the best games to see what HDR is all about is Ori and Will of Wisp as well as Ori and Blind Forest. The colors really pop and the games are just really fun to look at as well as play.