The ultimate Leica M9, Leica M10 and Leica M240 comparison - which is the best?

I believe you do not buy a rangefinder camera for its speed or for its processing power, but rather for the beauty of it, that specific manual focusing style and for the fact that it makes you slow down and compose your shots better. Do you own a Leica camera - be it an M9, and M10 or an M240? If so, leave a comment and let me know what you like about it and what changes you would make.