Mel, you may be right, but it would be more my memory that is failing than my ears!
I am travelling, and getting to intimately know my 6-month old NEX-6 and do not have access to my old film cameras for direct comparison.
I did not know that the NEX contained a focal plane shutter, so was surprised at the level of shake and noise, especially since I am also carrying an RX100 to compare against hence the post. On the other hand, I do find myself in situations where I used to use the OM1, but hesitate with the NEX-6 due to its noise.
I was specific about the noise interfering when taking near candid pictures, not posed, when the subject expects noise. And when taking pictures in noise sensitive environment, that is an individual criteria, maybe I am more discriminating than most.
I was only commenting about the shake at this point. Now knowing that it is generated by a FPS (which is not as bad as mirror flap), I will know what to look for in my images. But I do not expect to see any problems since with variable ISO I can keep shutter speeds reasonable, the optical stabilization will reduce the effect, and I have a boat anchor of a lens attached (15-200 zoom) -although the mass is in the wrong place to counter FPS shake. It will be interesting to see if I can still hand hold a light prime lens at 1/8 sec with no stabilization.
I will look forward to seeing you noise measurements. I suggest you also measure the OM1 with the mirror lifted, which will then be FPS noise only.
Hi Krispee (I hate monikers)
I am a camera collector, so I have quite a collection against which I can test. My OM1 is at far left on the second shelf. My XA is on the 3rd shelf, just to the left of the right shelf support.
It's really hard to appreciate shutter sound in isolation, friend, because of the differences in sound frequency, duration and intensity. One must judge shutter sound just as one would use the camera - in hand, held against the face. Raising the mirror in the OM1 would not be realistic because one cannot compose and focus an SLR with the mirror up.
That's why I believe so many have been misled as to the actual sound intensity of the A7. Many saw a badly made video in which a voice-tailored mic was used as pickup - so of course, all frequencies within the voice range would be peaked, and those above and below rolled off. In person, it sounds much more muted - especially when directly compared with an NEX-6 and NEX-7, as Don (1prime) and Henry (blue_skies) also appreciate at our recent Sausalito get-together.
The one situation where the NEX-6 is really loud is in the panorama mode, when it sounds really awful - especially if you are paired with a sensitive "significant other" who recognizes the sound and shoots you "that look."

Yes, I know the horizon is tilted - but I had to shoot with the NEX held above my head, and the withering look from my girlfriend dissuaded me from a second shot. It was nothing like the hired photographers got, so the couple and their parents were delighted. Shot with my old (1981) 35mm f1.4 pre-asph Summilux.
And in deference to my partner, this straight show without the machine-gun panorama simulation is probably better:
Old cameras can, like old loves, appear superior to present gear. After struggling through the Grammys last night, I wish I could say I like the new better than the old - but I can't.