For reference I own a high end large 4K OLED TV and high end large 8K QLED mini LED. 99% of people who talk about 8K are not owners and have experienced limited to watching some crappy in store demos, and they all say the same stupid crap about there not being a difference. I'm not saying this to brag, who cares that I waste money on tech that hasn't come down in price, I'm just saying 8K is the truth on large format displays and it will blast out your dopamine receptors, if that's what you're going for. I've tested everything you can imagine including upscaling 4k content to 8k using AI software.
First, If you want to see what a 4K porn file looks like when it's condensed down from 8K filming, see:
https://pornbox.com/application/watch-page/799445
Serina Gomez lick ass deep troat Facial and Squirting 8K
That video isn't my cup of tea content wise, but the 4k file shows an amazing level of skin surface detail and material detail (for example, the velvet on the couch). It even does so in spite of having an inferior bitrate of 15mbps instead of 30mbps. That's what filming at 8k does. Obviously, I wish analvids would post the actual 8K file and it's annoying that they haven't.
What I'm about to suggest would massively increase the level of detail on avids, for both 4k and future 8k viewing, and this ultimately adds to immersion (and warning, addictive nature of) this content.
(1) Film in 8K. It's not that expensive. A studio could literally finance an 8K setup for the cost of a single scene, less than 10k.
(2) Condense the footage using AV1or H265 instead of the outdated H264 that avids mostly uses. This allows you to post a greatly improved image with the same file size. Or, you can achieve an identical image quality at half the file size (Obviously, I'm suggesting they go with the former).
If you want to see an interesting video on why 8K is great, check this out (I'm not the guy in the video but agree with his take 100%):
Why 8K is NOT Pointless
https://m.youtube.com/watch?v=23vYTXcotSs&pp=ygUXV2h5IDhrIGlzIG5vdCBwb2ludGxlc3M%3D
Finally, I want to do an honorable mention in this thread for the Vira Gold studio. I'm not sure if they have a better camera, or if they are using better compression technology (h265 or av1), or something else, but for some reason their recent videos are some of the most detailed I've ever seen. The skin surfaces at GG are decent but muted and airbrushed looking. At Vira the past few months (after they resolved an old blur issue), you can see stretch marks, more pores, caked makeup, zits, moles, microwrinkles etc. Other studios like NRX come close but to my eye Vira is the best so far. I wish GG would model whatever they're doing, in addition to my above 8k suggestion.