Frankly, once you set up a 6x9 on a tripod ... I just use 6x9 Horseman backs on my little 4x5 Ebony folder, and the optical results are probably superior to any conventional rollfilm system, including the M7 6x7. Part of the reason for this is the availability of full movements which allows lenses to be used at optimum f-stops, rather than having stop-way-down as the only option to control depth of field. The other is the sheer number of lightweight lens options, many of superb modern design. The third reason is that the camera itself is modern and very well machined
in comparison to an old Speed Graphic, for example. But for "quickie" pot shot work, I'd sure like to have one of those Fuji 6x9 rangefinders.