The Mamiya 7 has likely the sharpest lenses of all in a MF package. There are some that believe the quality is on par with a 4x5 if used with say Fuji ACROS film. The Fuji/Bessa RF is only available as either a stand lens offering, or SW variant. You'd need 2. I'd therefore go with the Mamiya for both lens quality, and portability. The older Fuji RF 6x7 cameras that had interchangeable lenses are a lot older, harder to find, and bulkier.