I'm loving the TV after an evening with it. It's not transformative, but the improvement of HDR and 4K is subtle and strong the more I watch.
One review I read said these TV's try to apply an HDR like effect even to SDR content, and I definitely noticed. Playing some Gears 4 on my non-S Xbox (no HDR), there happened to be a section with a lot of fire on a wall in the backdrop, and it was far noticeably brighter than on my old set. This was something immediately noticeable even to a dummy like me.
Youtubes in 4k look really great, the colors really shine. There's one on the homepage about a black widow and some Steve Irwin type guy I keep watching and marveling at the color and I dont even think it's HDR (not sure how to tell if it's HDR when playing a youtube, but when I play DF's Forza videos an HDR icon momentarily pops up, and that doesn't pop up on this youtube).
I went to pick up an Xbox One S but there was a deal where you get a 50 gift card back that turned out to be online only, so I ordered online for store pickup and gonna get it in morning.
So yes really liking it now, the improvements aren't all in your face but they're pretty substantial too. And I have not seen something like a UHD Blu Ray where I assume the quality is strongest.
Oh also I always thought 1080P content upscaled to 4k might look bad. Nope, it pretty much looks fantastic. At least as good as on a 1080P display IMO, if not better. So that's a worry gone, Gears 4 1080P looks great on this set.
I have one niggling issue though, game mode combined with HDR is confusing to me. In normal content, the set lets you choose various picture mode like vivid, sports, and game. However on HDR content like the DF vids, it suddenly locks picture mode to "HDR" and you dont have any options (to change to game mode or any other mode). Rtings review made some kind of note about that, saying to put it in game mode before HDR in order to keep low latency on HDR , and that it will" keep the settings from the previous mode before HDR". But, I noticed the individual settings change (example, color temp is listed as "cool" in game mode but "warm" in HDR) so I'm not sure if Rtings just mean low latency is kept or what, since obviously the exact settings dont stay put. It's just the kind of thing that will bother me, I wish there was a more concrete indicator that low latency game mode was on in HDR.