I guess what I'm looking for the most is the layering, crazy instrument separation and clarity that the HD800 have
But maybe that's impossible
I’d say yes, it’s impossible from a set of speakers.
I've heard possibly some of the best speakers on the planet, that is all subjective anyway. If a speaker covers the frequency spectrum clearly within audible range and are good quality speaker drivers, then that’s taken as a done. Everything else is a preference. But I have heard a lot, big horns, some of the biggest studio professional monitors and high-end designs. Nothing comes close to the detail retrieval of the 800’s close to your ears, so they are just in a different league in that respect. The same for separation of instruments, low level detail, and layering within the mix. It really is astounding what they separate and their ability to do that. I have never heard any other audio component to do as the HD800S does, and I’ve owned lots of good headphones as well, ‘audiophile’ and ‘studio’ cans.
When you lived with the 800’s for a while you just think right, that’s it, there’s nothing better regardless of what thrills are added now from other cans or cost. Speakers are just crap in comparison

I say that tongue in cheek because I love speakers, owned hundreds! But they’re all just effects boxes really, some you dig, others you don’t do as much. They all do something different. And speakers can move much more air or, objects, or even walls

. And are generally more physical in nature, which headphones won't do really, unless they’re haptic ones like skull crushers gimmick ones. Speakers can create that real in room sound I suppose better than headphones, but if you are listening critically deep in the mix, nothing comes close the best headphones, and since owning them, the HD800S are the pinnacle of that. I’ve said it before, these are a microscope or a flashlight into and on the recording. They actually sound ok to me as well enjoymentwise, they give it to you in an audiophile way. That to me anyway doesn’t make music sound bad like some ‘studio’ stuff can do. I still like to EQ them to my preference though. That way, I enjoy them more. And there’s still better headphones at much lesser cost as well which will do bass better, again though it’s a personal preference. I can listen without EQ and still appreciate them but why, I like a signature / presentation I like to listen to, to get the most ‘enjoyment’ out of music.
I don’t claim to have superior hearing to anyone either, but for the record, I did get my hearing tested because I thought I had some ‘issues’. Well it turns out the audiologist said I measured as the best he’s had all week, that’s in comparison to what he had that week obviously. Can't claim to be a winner in a one horse race

It’s not super human it’s just a good healthy set of ears. Wish I could say the same for my eyesight it's useless I can’t spot or make out hardly anything long distance unaided, I’d be a useless witness, need 20/20 for that

But ears are all good.