I just received my chrome 50/1.5 VM today and am quite impressed. Checked critical focus at all MFD and all apertures and it was pretty close to dead-on with my M-D (ever-so-slightly back-focused at f/1.5, with focus point right at edge of depth of field, dead-on at all other apertures).
Bokeh is nice, lens is sharp and the chrome body is a thing of beauty. I can't wait to go shoot with this thing.
I also own the VM 35mm f/1.4 S.C. and while the build quality on that one is nice (it renders pretty well too, like a 35/1.4 Pre-ASPH, but sharper wide-open), the 50 build quality is on a whole other level.