Pentax Q and DSLR excel as quiet cameras
In Germany's magazine c't fotografie latest issue is a article on quiet photography. In normal mode the Q7 model is the quietest system camera overall and the Pentax K5II the quietest dSLR followed by the K3.
The quietest camera in silent mode is the Panaonic GX7
The sound the camera made was not a motivator for me buying the K3 but it is something I really appreciate.