Upload & Sell: Off
Why do people speak of range finders and SLR cameras in the same breath? They are different cameras, with different applications and advantages/disadvantages.
Are medium format range finders any different to 35mm range finders? I think that unless you've come from using a range finder, and love it, then why would a medium format version of the same camera be any different.
A range finder won't allow you to change film mid roll, use polarising or ND grads easily (if at all), framing and parrallax are bigger issues, questionable focusing accuracy.
If I where using film (and I shot RZ's professionally for many years, mainly E6 but also B+W for personal stuff) I would want interchangeable film backs, I would want to be able to shoot 'roids if I needed them to test lighting, and I would definitely want to be able to use filters such as grads and polarising filters, because you can't just fix it in Photoshop if your intention is to print them in B+W.
Range finders will always be range finders, great for some things, crap for others.