M7
A factor not yet discussed is the timing of slow shutter speeds.
For all M cameras except the M7 and M8, there is a clockwork mechanism inside of the body that runs for speeds of 1/15 and slower. This is often heard as a slight hissing sound during and after the shutter actuation.
For the M7 and M8 models, slow speeds are electronically timed, and the closing curtain is released by electromagnetic techniques.
Another option is to muffle the camera through the use of a case or a blimp. I find the M8 is noticeably quieter when in a Luigi's half-case.
I also agree with the others here in that the ultimate quiet camera is a digital point and shoot with the shutter sound disabled. The only moving part is the shutter release button itself.
Eric
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