On the left, a resolution test from DP-Review taken with the D60 on a color test chart:

http://www.dpreview.com/reviews/sigmadp1/page20.asp

On the right, a sample of an all B&W D60 test chart from the same review (thus the same camera and lens):

http://www.dpreview.com/reviews/sigmadp1/page19.asp

Note the significant color moire on the left vs. the right.