the ZD back does give a more 3D type image, probably due to the slightly narrower focusing differential of the larger sensor... I slightly prefer the overall colour rendering from the ZD. Also, the Mamiya lenses show more uniform illumination and sharpness at the wide end
Those are three interesting specific ideas. Let me make sure I understand them:
1. "3D type image, probably due to the slightly narrower focusing differential"
Does that refer to the depth of focus issues of larger formats? When shooting MF at f/16 is really looks like f/8 on 35mm, hence more out-of-focus background and greater sense of depth?
2. "prefer the overall colour rendering"
Isn't this something easily adjusted in PS, or is it something else?
3. "lenses show more uniform illumination and sharpness at the wide end"
Of course, for landscape work (all I would be using it for) I would tend to shoot at f/11 or f/16. At those apertures, this becomes a moot point, yes?
Thanks for being specific!