Sigma SD1 reviewed and compared (645D, M9, A900, A55) at Luminous
Luminous Landscape has just posted a review + comparison + another perspective of the controversially-priced Sigma SD1! The comparison part compares the SD1 to the Pentax 645D, Leica M9, Sony Alpha A900 and A55. Pixel-peepings and color chart ISO comparisons are included!
Notable by their absence from this comparison are Canon and Nikon DSLRs. The review notes that the Alpha A55 stands as a proxy for the APS-C DSLRs with the popular 16mp sensor, but that does not explain the absence of a Canon 7D or 5D Mark II or Nikon D700. (FYI, there is a typo in the review, under "Sony A55", it means to say Nikon D7000, not D700).
Reactions to the review+comparison
+ discussion at dpreview Sigma forum
+ checking for more