I used to fish the Frying Pan in Basalt each summer. The Taylor Creek Fly Shop there had a very nice CDC Comparadun pattern. Their pattern had either malard flank or partridge fibers in front of the CDC which added to the definition of the CDC wing.
I have been tying some using EP fibers or other fibers in front of the CDC and I think it works well.
The "Improved Sparkle Dun" added winging material to the BACK of the deer hair. In the case of CDC, I think it needs some definition in front of the CDC.