The shutter sound itself was never the issue for me; rather it's the obnoxious motor re-cock noise. On my wish list for what turned out to be the M was a way to eliminate or muffle that sound (or even offer a manual re-cock if that were possible). I'm pleased Leica addressed this issue with the M by shortening and muffling the sound. I haven't held the camera, but some videos I've seen comparing it to the M9 (one by Thorsten Overgaard) makes the difference clear.
Before I bought my M8.2, I tested 2 cameras in a local Leica shop against 2 M9s. The Leica rep released the shutters while several of us in the crowd closed our eyes. Not anything scientific, but everyone thought he M8.2 was marginally quieter each time. I still hated the sound compared to my film Ms, and hoped the discreet setting would compensate. But I never liked discreet mode, since it only delayed the inevitable.
Kudos to Leica for finally addressing the real issue, restoring a more film-like experience.
Jeff