My conclusions? So far I am very happy with my Leicas. As with the X1's lens, the M9's f/2 Summicron is exceedingly sharp with high contrast. I am enjoying converting some color photos to black and white, particularly portraits and scenics. Black and white can be used to eliminate competition between colors for attention and to emphasize composition. With the Leicas I am more deliberate in framing my shots and more appreciative of the basics of exposure (it is nice to have manual control over f/stops, shutter speed, ISO, and focusing).
I will keep you posted as I become more familiar with both cameras and continue my exploration of photography.