I don't have a KT-HA (I've only got one in Black) but I do have a C3-HA.
I don't have a photo of my C3+KT2 online though...
Bernie did the honours though - nice one!
The "SW02" clickie TailCap gives some SureFires a bit more balance and in some cases (such as the M4) it really enhances the ergonomics in my experience. It's an expensive component but if you have no need of the C3's CombatGrip ring I believe it is worth it.