I'm one of those slow learners... Trying to save money I bought CV and Zeiss lenses for my M240 and basically wasted good money trying to save some...
Not that the CV lenses are bad, and the Zeiss Biogon 35f2.8 is excellent. But while "they" tell you you can shoot with all these alternative lenses in the M240, the fact is that the only really easy lenses to use with it are the 6bit coded, most modern versions of Leica glass.
Now I'm having a fire sale of my nice little CV lenses, my Zeiss and even the Panasonic GX Vario 35-100 f2.8, all of course at a loss to try and defray the cost of the 'Cron 35f2 ASPH that I just bough from Pop Flash (great source of lenses BTW). So now I know, keep my fingers off the "buy now" button until I can get the "real" thing LOL!
At least now I have some nice lenses that work very well with the M240 and are even color matched