Not sure about that one. I use a newer 6, not the MF. It's hard to do a search on flickr I find because both cameras are so similarly named.
I would take a stab though and assume that quality would be closeish. The M6 isn't really that great for shallow DOF. It can be done but the bokeh isn't as nice as some other MF bodies out there. This means most images will be stopped down to where lens performance is the highest.
Honestly though, I couldn't tell you. Sorry!