IT8 1

Kodak IT-8 Q-60E3 Target for Kodak Ektachrome. Shot with different illuminants. The tungsten illuminants (including "soft white" CFLs) were filtered with a single layer of Rosco #3202 tungsten-to-daylight filter. Shot in raw with a Canon 60D and converted with Adobe ACR. I normalized white balance by clicking on the 5th gray bar. I normalized brightness by adjusting the exposure slider in ACR until the brightest color (pure yellow) was just below clipping.

IMO, the two "soft white" CFLs show considerable color badness. But the daylight balanced CFLs show negligible color difference compared to the illuminants that use real tungsten.