Aah. Somebody's been wet-dreaming again.
Pixel-binning and weak/missing AA filter are technical characteristics that have no appeal for real photographers - just for the techno geeks that came up with this lame rumor.
It's been noted in various photography forums that the Leica M9 with 18MP delivers a picture that exhibits finer detail than do any of 1Ds3 (21MP), 5D2 (21MP), Sony A900 (24MP) and Nikon D3x (24MP).
But maybe your "real photographer" doesn't use high end equipment like professionals do.
M9 got better picture is due to the combination of the following three factors (in order of importance): 1. Much better lens than Canon, Nikon or Sony. 2. Better DSP. 3. Removal of AA filter ( with the potential of Moir under certain condition)
As for Leica being used by professionals, this can be a very interesting situation. Leica is being used mainly by high end enthusiast with a deep pocket. A very small percentage of professional will use it. the reason is due to high price for the body and the lenses. Also even it can be used up to 135mm focal length, it is already a pain in the butt, due to small frame in the view finder. So the usable focal length is from 21mm to 90mm. You cannot use it for closeup, period. How many professional can live with these limitations???