Color with the Sigma DP2 Merrill
A lot of color variation is possible here, but the Sigma DP2 Merrill seems to do quite a pleasing job on the color of these tulips.
I should have the Sigma DP3 Merrill with its 75mm equivalent lens with a few days.
B&H Photo has the Sigma DP1/DP2/DP3 Merrill available.
Choosing another white balance (“Sunlight” above, “Auto” below) can produce a quite different color effect.