So if you’re going for something like OLED, then definitely the difference is real and noticeable. HDR by itself I don’t think means that much, as you can have an ass panel that is technically HDR. It’s all about how you achieve it.
To put nuance on it, whether it’s worth getting really depends on the games/applications you want it for. If you plan on playing games with good HDR capabilities, or watching content that supports HDR, and you do plan to get a real good monitor, such as an OLED, then I do think it makes a serious difference in visuals that is both meaningful and satisfying. A high-end LCD or microLCD that can hit 800 nits or more, probably a good option as well.
Basically any of the flagship gaming monitors that reviews are hyped about the HDR performance, there’s a there there.
For reference, I have long been rocking a pretty plain non-HDR, LG 4k LED monitor and was happy enough with that as my main despite only being 60hz. Then, I built a new PC early this year, and decided I needed a faster monitor to go with. So based on value, went to a 165hz 1440 HP LED with basic tier HDR 400 support, and it was pretty good! I noticed some improvements, and it does help with color a bit. But being LED still, it wasn’t exactly mind blowing. For sure, it did provide the smooth response of a high refresh, but otherwise the HDR it offers isn’t a big difference in visuals from the old screen. It was not part of my purchase decision as HDR 400 is like the bare minimum. A step up but nothing I was overly excited by.
And then, (in a case where targeted advertising and algorithms actually worked) I started seeing videos for the new Alienware QDOLED monitor, and got really interested in trying a new technology. And so due to a deal on refurbs from Dell, I recently got the new Alienware AW3423DWF and THAT thing is a beast. I can honestly say it really has made my PC gaming more of a joy than it has been in a while from a visual perspective. I mean the Ultrawide and all that is one aspect but the vivid colors and intense contrast of the OLED is absolutely the star of the show. So even in 16:9 it would be a great display.
To put it another way, despite the Alienware panel being a 1440 display and my LG being 4k, watching a test video I see more detail in the OLED display due to the contrast and color intensity. The highlights just feel like seeing daylight. And the same effects are in games I play. On the 4K panel, there is detail to be found but certain regions get muddied together and so the extra pixels aren’t able to offer much fidelity.
I’m saying all this as someone who has very little tech savvy around HDR and all that. The different modes, the gamut, the whatever, I don’t really care that much. I wasn’t all that concerned by it for a long time. I was happy to just chill with a run-of-the-mill display. But I’m not regretting finally making the upgrade.
I would say for the money I’d rather have a top-tier monitor and a mid-tier GPU than a top-tier GPU and a basic monitor. You get much more visual bang-for-buck with a better display.