SD1Merril images in DPReview image compare tool

hi please excuse me if this has been posted before

but when i used the DPReview images
http://www.dpreview.com/reviews/sigmasd1/19

the Sigma image at iso 100 looked way undersaturation
than the other images (Pentax K-5, Pentax Kx, Pentax-01)

so i opened it up in psp7. It took (a lot) of saturation to
get close to other images

so---is the DPReview SD1Merril images converted
wrong, or is this the intended effect?

thanks