Thanks for the suggestions! Do you think HDR will be worth it though on PC? From what I have read the support for HDR on PC hasn't been great and there is not really a benefit because of how close most people sit in front of their monitor, not sure though.
very simplified explanations:
The first important difference between SDR and HDR displays is the contrast ratio. Contrast is measured between the "brightest whites" and the "darkest blacks" a TV can display. Good SDR displays have around 350 nits, while good HDR displays can go up to 1000 nits (peak, short bursts). This increase in contrast makes whites more bright and shiny and blacks even darker in comparison. This allows for more detailed images, especially in dark or very bright scenes.
Then there is the colour depth. A TV is receiving three different sets of colour shades/intensities (red, green and blue) per pixel to display an image. The bit depth of this three transmissions determine how many combinations there are. This limits the number of colours that can be transmitted/displayed. First PC screens operated at 6bit, modern screens operate at 8bit. But even 8bit isn't enough to guarantee smooth transitions between colours and the end result is banding: a jump from one colour to another. To avoid this displays often use a dithering technique that interpolates between one colour and another.
Good SDR displays operate at ~350nits and 8bit colour depth, resulting in a very good image. But it's impossible to show the finest details and graphic designers are fitting their artwork into those specs to make them looks as good as possible.
Low to mid range, HDR Displays operate in between 400-600 nits and 8bit+ (aka dithering) and 10bit.
Good HDR Displays have 600nits on average and a peak brightness of 1000nits and operate with 10bit, 10bit+ or even 12bit. Those Displays will give you a much better, more vibrant and detailed image quality. When fed with the correct input!
There is, of course, a lot more to this. But a good HDR display will have a noticeable, better image then a SDR display. Independent of sitting distance. It should actually be even better the closer you are.
For the rest of your question: Yes, PC HDR is strange. You can sometimes activate it in games, you sometimes need to use the windows 10 HDR features. And in general HDR isn't HDR and the improvements can go from "unimpressive" to "this is good", but that's also the case for console HDR. Some displays only go up to 600 nits and 8bit+ so the picture on them will look different then on an 10bit+, 1000 nits display. You never know what the graphical designer had in mind for the scene or what they used themselves while designing it. It's a mess on all systems imo.
Is HDR worth it? It's very good, when fully implemented and on high end displays. But those high end PC displays are very expansive, early adopter tech. They have flaws, they don't work all of the time and there is a lot of fiddling involved. Early adopter tech is never worth it from a price/performance perspective, but they are great.