After two years of using CV lenses on my M9, which are great performers by the way, I went nuts and was able to get a new 50 Lux with a trusty Leica dealer (and avoid the price gouging from used Lux's selling for $4500+). I've never owned a Leica lens other than an used 90 Cron (pre-asph) that rarely sees any action, because it's just too heavy and big to use on an every day basis.
I took a few test photos with the 50 Lux around the office as well as some with my trusty Voigtlander Nokton 50/1.5. By looking only on the M9's horrible LCD, at wide open apertures, the Nokton appears to have a slight sharpness edge over the Lux. But the Lux has more contrast, creamier bokeh, and more "pop."
When I got home, I took a couple of photos of my neighbour's flowers as my usual trusty model (the girlfriend soon to be fiancé) is out of town. The Lux really produces a good 3D pop when I'm able to nail the focus. That DOF seems to be razor thin though, relatively thinner than the Nokton, even though the max aperture is nearly the same (1.4 vs. 1.5).
f2 ... I think.
f1.4 or maybe it was f2
ps: I decided that I better buy all the gear I can right now, before my gear slush fund disappears when I get hitched.