Donald Qualls
Subscriber
Pentax 6x7 system. Significantly lighter and smaller than the RB67 system, both in camera and in lenses.
OTOH, the RB67 is (IMO) significantly more versatile. Switch films in mid roll, check. Multiple formats via alternate film backs, check. Multiple viewfinder options, check. Portable biceps exerciser, check. Fisheye lens option, check. Sync at all shutter speeds, check. No hot shoe on the body, due to shutters in the lenses, can't use it like a 35 mm SLR -- but I've got plenty of those if I want to shoot that way. Also, if I have a shutter problem, switching lenses gets me back in operation (working around the failed focal length) immediately.