Now don't get me wrong, I own and enjoy Leica cameras. But I think this "intangible feel" thing that is unique to the Leica is taking things just a touch far IMHO. I start to wince everytime I hear this. I think this is one of those arguments that get other camera owners a bit grumpy.
I own a Minolta SRT-102 in which the film advance is as smooth as any Leica I have owned. The lenses focus very smoothly with just the right feel of weighting. The shutter is a dream to work with, it may be a touch louder than an M4, but not by much. Everything works perfectly in synch, and it also capable of some lovely photographs. And this camera was a LOT less expensive when new. And then there is the Nikon, the Pentax, and many others. There is a reason that the Japanese stole the market from underneath the Germans. They started building some very nice cameras for a lot less money than the Germans.
And I own other cameras that operate just as nice, and feel just as nice in the hand, maybe even nicer. The Leica is a very nice rangefinder, but it does not have any patent on how a camera should feel. Even in the early days there were some very, very nice cameras out there, and I am not just referring to the Contax.