This echoes well with my experience -- I shoot the M9 as well as lots of medium format film and the results mesh together well. I just printed an exhibition of landscapes that I shot with 6x6, 6x7, 4x5 and the M9. I could print the M9 files to about 17x22 before the digital-ness set in (mostly aliasing and moire in fine detail like grasses and water), but the color is the most film like out of the box than any other digital I have worked with. I have owned a lot of digital cams myself, and I own a custom printing lab, so I see a lot...
I did several shots on 4x5 EPN as well as the M9, and after some basic white balancing, the results looked startlingly similar. EPN was always regarded as the most color-accurate film, so to have the M9 match it so well was really interesting. This is not just me either, I had two other professional photographers who mentioned the same thing upon seeing the slide on the light table and the M9 version in lightroom.
I still can print larger from film since it decays more naturally -- it just gets gradually softer, whereas digital tends to start showing aliasing, moire, visible sharpening artifacts, rougher tonal transitions, color noise etc etc. These can all be greatly diminished in post, but at a certain point the files just start to look unnatural, where film just starts to look a bit soft and mushy, but still natural. And of course, 6x6 to 6x7 and larger still has a bit more fine detail than the M9, so consequently you can go quite large without a problem. The largest images in the exhibition I did were 1 meter square (40x40in), and they look superb.
What I take away from this, however, is not "film is still superior" or "digital is more practical", but that both are fantastic mediums to work in if you take the time and care to learn how to use them correctly. The M9 is the first camera for me that allows me to forget about the digitalness of the image and just focus on the photography -- the files mostly look like the color shots I used to make, and the shooting experience is just like the classic film rangefinders that I love using. It's great!
So thanks very much for the comparison, because it is good to see someone else having a similar experience...