Simply a personal observation: I've only been around 2 Fuji MF users for any significant time. One was initially excited, promoted the heck out of it at a couple of shoots. After a couple of months he sold it and went back to his Sony FF. The Fuji ate up too many computer resources and added significant processing time for negligible benefit to him. The other may still have his, but I know at the last two events he's been using his Canon again, the Fuji left at home if he still has it.
I also know of one longtime Pentax 645Z user who made it to one of our shoots too, but I recall him commenting that it wasn't as convenient in the field so he didn't usually use it at model calls and outdoor portrait events. I remember his photos from that one looking very nice, but they didn't definitively stand out from others using FF and even APS-C cameras (me).
I don't think you'll see any benefit from MF for anything posting on a social site. Medium format seems more ideal for studio work and paid portraiture, or grand landscapes to be printed for resale. Definitely not a daily shooter IMO.
For the money, and if you've talked yourself into giving MF a go, I'd opt for a used Pentax 645Z and one or two lenses and see if the format is for you. You'd be unlikely to lose any money on it if you buy carefully, resell it for what you paid or within a few dollars of it. If you really REALLY like medium format, and after using that 645 for a bit can see reason to go with the Fuji instead then go for it. If not no real harm and no foul and you've saved yourself a boatload of money.
I totally understand the attraction. I've had to have a serious talk with myself about it more than once, and really came close to pulling the trigger a few times. But common-sense says I'm not going to see enough difference between my K1 and the 645Z to make the move worthwhile. Look for a few reviews where folks have gone back to full-frame and their reasons for doing so, along with comparisons of high pixel FF vs. MF images. They're not that different in most cases.
Last edited by gatorguy; 08-03-2022 at 04:53 AM.