I have had two Colt Series 80 GC MKIVs, one blued other stainless. Both had loose Frame-Slide and Barrel-Slide fits. Lousy gritty creepy triggers. Did not like the wide triggers too. The rear sight pin worked loose, but that was taken care of easily. Accuracy in my not-so-skilled hands was just like the regular Government models, minute-of-bond paper at 25 meters. Never really impressed me and kept me wondering what all the buzz was about Gold Cups. Eventually sold both.
Guess what I am trying to say is that the GC is not a target pistol out of the box, just my .02 of course.
No experience with Kimbers, sorry.