It’s subtle but my IIIf shutter seems louder than my Model C, Model D, and Model F Barnacks. No idea why but the black/nickel cameras just seem quieter. Maybe it’s because they’re prettier…
The shutters in the thread mount Leicas are all very similar. Ball bearings were introduced during the C production. There doesn't seem to be much difference between the those shutters and the M3 shutter. How quiet they are mostly depends on how well-meshed the gears are and how clean everything is inside. But the loudest one I have is a Leica III that was converted from a I.
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