Color accuracy of Nikon cameras after saturation correction:
D2Xs - mean = 4.62, stdev = 5.48
D200 - mean = 6.69, stdev = 8.02
D80 - mean = 5.6, stdev = 6.65
D40 - mean = 6.57, stdev = 7.97
Color accuracy of Canon cameras after saturation correction:
5D - mean = 4.98, stdev = 6.68
30D - mean = 4.77, stdev = 6.55
400D - mean = 4.7, stdev = 5.83
NB: The greater the mean value, the greater the deviation from true color.
Taken from:
http://www.imaging-resource.com/PRODS/D200/D200IMATEST.HTM
http://www.imaging-resource.com/PRODS/D80/D80IMATEST.HTM
http://www.imaging-resource.com/PRODS/D2XS/D2XSIMATEST.HTM
http://www.imaging-resource.com/PRODS/ND40/ND40IMATEST.HTM
http://www.imaging-resource.com/PRODS/E5D/E5DIMATEST.HTM
http://www.imaging-resource.com/PRODS/XTI/XTIIMATEST.HTM
http://www.imaging-resource.com/PRODS/E30D/E30DIMATEST.HTM
so...with the exception of the D2Xs, canon color is more accurate?