you might want to check out ArtIsRight's review, he's a photographer and does detailed comparison's of all the M1's (and some Intels) on various photo specific apps and tasks. It's a bit surprising because he's finding, at least with the machines he's tested, that the MBP's do some things faster than the Studio (Max).
Looks like some of the reason could be centered around the speed of the SSD used in the Macs, especially write times. The SSD's tested were not all the same size, often the larger ones are faster (like the ones used in some MBP's here). But here, he finds the Studio (Max) 512GB is slower than the one used in the 16" MBP M1 Pro. What this tells me is if getting a Studio, maybe don't get the 512GB, but start with the the 1TB. Also, as we know now the SSD's in the Studio are socketed, not soldered like the MBP's. Could be part of the reason.
He also finds, as you move along in the review, that the MBP's load doesn't waver much on some tasks and all cores stay constantly in use, but the Studio has peaks and valleys. Possibly this is something Apple can work out in the future. Or not.
I'll put this here starting at the SSD comparisons.
Given what he's found, maybe a 16" MBP M1 Max is an option to seriously consider. Though it's pricier than the Studio M1 Max.
PS. and what his review has confirmed for me is for
my photo editing needs, a
desktop 32GB, M1 Pro machine is all I'd need. The current, ahem, planned(???) hole in Apple's lineup.