I fully agree with the 6x9 and Nikon scanner recommendations. (This said by an Epson 700 owner.) One other thing is the fact that 120 film as such (given the same emulsion as on 4x5) resolves a bit better than 4x5 film. At least this is the opinion of the Sinar factory and their research lab. (OK, I read about this in a brochure about the Sinar roll film backs. But I don't think Sinar would publish, even in their own selling material, something fundamentaly wrong.)
As the size difference would make up for the slight advantage of rollfilm, a properly exposed/processed 4x5 sheet would probably come out "on top", but not by much.
//Björn
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