Originally Posted by Sycraft
When done right, it is very nice. Just this week I got a new TV that does HDR and I've tired it out and it is pretty impressive. The Grand Tour looks great in HDR. Very bright and colorful (HDR content specifies a wider color gamut, which HDR TVs usually can handle). The difference is easy to see between the 4k HDR and 1080p SDR versions. It is more noticeable than the 4k IMO. That said, regular SDR content looks great too
However, as with anything, the mastering and such plays a big role. The first thing I tired was Sabrina on Netflix, because it was the first thing I found with listed as HDR. It looks very "meh". I was playing with the brightness because it just seems kinda dark and lifeless for the most part. There are some scenes where there's bright colors, but the overall looks is kinda dull and washed out. I don't know if that is on purpose, or if whoever mastered it just isn't very good, but it wasn't impressive.
I'm definitely not an expert, just an enthusiastic user, but my understanding doesn't always mean it's brighter and more vibrant, I think in some cases it's allowing for it to be actually darker, because you can have more visible in the dark with HDR. I agree that doesn't always result in the "wow" factor right off the bat, but I think it's still a legitimate use/choice. That was my impression of Sabrina, I didn't think it was washed out, but it didn't really pop with a lot of highlights. But I only watched maybe an episode and a half.
Now, there are some other things, like off the top of my head The OA or Death Note, which to me had virtually no HDR "goodness". I wouldn't have guessed it was an HDR grade at all. Now in some cases, the content just doesn't particularly lend itself to HDR anyway, like something like War Machine on Netflix which is just mainly a talking heads movie, I just pretty much write those off. But something like OA or Death Note to me could have had a lot more HDR flavor, and just didn't.
So anyway, I agree it's different from content to content, and I think sometimes it's a creator's choice, and sometimes just blah treatment.