I have sorta' -I did not have a DP2, but rather a DP1, so it was not really an "upgrade." Furthermore, I am actually quite recent to the Sigma world having just bought the DP1 a month ago. The results I saw from that are what made the jump to the DP2M the easiest photography choice I may have ever made.
The new DP2M is just about my dream camera. I have tried EVERYTHING and it is shaping up to be my Holy Grail. I have posted a few shots on site here already, one in the very folder (Point-N-Shoot) as this thread. Have a
LOOK HERE and also follow my siggy out to Flickr where I have been compiling a set. Make sure to check them at the largest size available to you!
I have lots of thoughts racing through my head regarding the DP2M and have been busy on the film side of things, but I will be happy to try and answer any questions you might have and eventually offer some of my take on it as well!