The hype didn't live up for me. Friend gave me a demo of this on his 55" LG OLED and 55" TCL P Series. HDR was noticeable and a little too bright in a dim room, but I wouldn't say it's as revolutionary as tech writers have claimed to be. I thought the Dark Knight's Blu Ray on his OLED was the bigger sell, it was like when I viewed it on a Pioneer Kuro a decade ago.
I first saw OLED in 2008, a 4K display in 2012, and an HDR display in 2015. That was bleeding-edge tech for the 1% crowd/AV hobbyists, and I figured 2018 was the year when all three would be affordable and mainstream. Frustratingly, it's still not there yet. I think another 3-5 years is needed until 4k HDR is widely adopted by TV/movies with grading standards and the hardware pipeline to show it is easily affordable.
Although prices have decreased a lot, the actual amount of proper4k HDR content is still limited. Other than a handful of UHD discs like Planet Earth II, I'm still waiting to see it widespread like for YouTube videos or HBO/Netflix streaming. It's not just content either. I looked at the cost of a 75"+ OLED TV, native 4k HDR projector, desktop monitor, UHD player (my PS4 should have had this), UHD discs, and that satellite/cable TV bandwidth still doesn't have 1080P uncompressed.
This reminds me of 3D, which lasted from 2010-2017. Proper native 3D movies like Avatar, Hugo, and Prometheus looked spectacular, but they also had a learning curve and huge cost for producers.