Camera is less important beyond functioning.
I'd say the choice of camera body is pretty important. It determines how you interact with the camera; if you hold it at eye level or not; whether the shutter release is in a good place for you,..
I can't comment on Hasselblad; I've never touched one. They are expensive and people say they're very, very good. All the accessories you're likely to want exist for a Hasselblad. But, if I had spent that kind of money on a camera, I might feel inhibited from doing some of the stuff I do with my cheaper cameras! Also, it seems to me internet fora like this have a lot of posts from people who jammed their Hasselblad.
The Pentax seems like a good camera for hand-held use. For landscape and architecture photography, I would expect to want a tripod at least some of time. (myself, I'm often impatient, and want to cover some ground hiking in between photos, and those days I leave the tripod behind). But if I'm using a tripod, an eye-level finder can be a pain. The WLF allows you to use the camera low down more easily. I don't think I'd buy a MF camera that can't take a WLF. Also, if you decide on the Pentax, get the 645N ii, which has mirror lock-up. The mirror is bigger on a bigger SLR, and can shake the camera, and reduce the advantage of using your tripod.
My 'best' MF camera is a Mamiya 645 Pro (It allows either a prism or a WLF. I have both, and wouldn't be without both.) I like the lenses I have, but I don't have the 35mm; the 45 is as wide as I usually want to go. There is an issue with some of the Super/Pro/Pro TL cameras (the later ones with polycarbonate bodies); there's a little part of the mirror rest - a spring with a plastic block attached - that breaks (for some people) and as far as I know no spares are to be had. Some people will caution you against these cameras, but I have had no trouble with mine.
+1 on adding Bronica to the list to consider.
I'll throw in one more suggestion, with apologies because it doesn't relate to your list at all. I have a Century Graphic; it's a baby field camera, for roll film. I use it mostly on a tripod, and I focus on the ground glass at the back (there is a rangefinder, which can be set up to be correct for one lens, so it can be used hand-held, but it's by no means the easiest camera for that). It has basic lens movements - like having a tilt-shift lens. I have film holders for 2¼x3¼ inch ('6x9'), 6x7 and square format. If you want one, they're mostly in the US. Whereas some of the MF SLRs are quite like using your 35mm SLR, this camera is a completely different experience.