I've a Fuji GA645. It's a superb camera. Sharp, lightweight, very portable, though every time I took it out in front of my friends, they started laughing at it for its size. But it's very "small" in the MF world, I guess. I once saw a Mamiya 7 on a shelf and it looks much bigger than my GA645.
It also has a small flash that sometimes can be used as a fill-in flash in daylight. I also bought its dedicated flash bracket that is very handy. It allows me to mount the camera on a potato masher in 'landscape' mode.
BTW, is Bessa III the same as Fuji GF670?