What size prints are you looking to make? You can make very very nice prints up to 40x60 or 50x70 (inches) from 40MP. And these are "stick your nose in the print" maxes. For further viewing distance, you could certainly go larger.Nice video on the S2 functions David, adn thanks for the iPad functionality info as well.
I love the Leica S2 and love even more the S2 series lenses, just a joule, but this time around I passed on that particular system do to needs and applications, so I kept the 1D IV, and now trying to make a decision amongst the 60MPM big boys, or at the lowest the 50MO range, but just don't really want to go to the 40MP margin, unless off course I was to literally try out the H4D High ISO and fail in love with it, but this will then leave a problem with image size for extra large prints, main reason for which I look to purchase a 60MP range MF system.
Just my 2c.
David