Them MF SLRs scare me a bit, they are rather hung
if you know what I mean, as in
large. Even the small ones hang heavy.
Apart from the Pentaxes, at various times I've been looking at the rebuilt Pentacon/Russian models... but I keep shying away. Every month I pick up a couple at the camera show, heavy bricks they are... and the Pentax 67 lenses are the biggest damn things I've ever seen.
OTH: the modern RF MF cameras are reasonably portable and give excellent pics. There's a whole line up of Fuji fixed lens cams, the wide angle especially looks excellent - makes fantastic pics (I've never had one). Then there's the Mamiya 6 and 7 which go for big bucks unfortunately. I see them fairly often in New York actually, around guy's necks.
The real sleepers are the Koni Rapid Omegas - though these are large, they have awesome IQ... and go for very cheap, being an out of favor configuration.