You may want to read the comments about that review in its own forum from DP1 owners.
Also to add to the comments about the Leica (V-Lux) - the transfer times between camera and iBook etc are awful - unless you put the card in the Sigma in which case it is superfast! The V-Lux LCD screen is great due to the way it twists and makes the new Sony one look a bit lame..
Sigma Raw is not supported from the DP1 in Aperture. Sigma raw software is excellent and exports 16 bit tiff.
I hope to buy a Digilux 3 next which apparently works well with Phase One Capture software.. I really do not expect it to compete with the DP1 tho? Again the zoom may be useful and the f2.8 lens (the DP1 is f4 sadly tho with 15 second exposures it does brilliant night photos..)
The negative talk about the Foveon sensor is vested interests talking.. and a deeply conservative trend in the photographic industry? Its the pc vs mac thing and a lot to do with creative flexibility - my impression. Have a look at what this guy is doing..
http://photo.net/photodb/user?user_id=1675561 - ..technically (the adapting of use of the Foveon sensor with Leica lenses..)