I have the small Sigma DP2. The quality is excellent, you can upsize the
image for the factor 2 without problems. Factor 3 as claimed by Sigma is a
marketing hype, that doesn't work.
Next point is the crippled raw format of the Sigma raw files. That means you
have to use the Sigma software to convert your images, with is a PITA
because there is no possibiliy to integrate a color profile into the
workflow. With the X3F Tool (third party software) you can use color
profiles for the SD files, but not for DP files.
Thread about the X3F Tool:
Sigma Links: http://www.stv.ee/~donq/sigma.htm
With the files from the Sigma DP series you can use Lightroom, but you have
to convert to DNG to generate color profiles from the Colorchecker Passport.
But with the next version of Lightroom this should be possible also directly
from X3F Sigma raw files.
So check your necessary workflow and your needs before buying into a Sigma
system. Think about the loooong product story of the SD series...
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