Ha-ha, Sigma have created something more exclusive than a Leica!
Which might be reason enough to want one... Looking at the output it does seem like a very nice piece of kit, but I think only for the hard-core enthusiast. I'd certainly have to have a lot of disposable income to want to buy one, as 16.6mm f/4 might be somewhat limiting. However, it's a good pathfinder. I'll stick to the 400D in the meantime. Come the DP2, maybe it'll have a zoom lens (or even a lens mount?) and then it'd be a pretty dangerous contender for the other high-end compacts.
I keep looking at it and the pictures and for some reason now I really want one. Think about it this way. The DP1 is, if nothing else, a marketing coup: a unique product that's stimulated a lot of talk. And Sigma already have an extensive (cross-platform) lens line up. If they were to produce, say, a lower-end Foveon-based SLR body...