Kimber uses a serious Loctite on the sights. It is plastered under the dovetail of the sight itself. It takes some serious impact (more than enough to squish any brass drift) to begin to move the sight. Even some really tough sight removal tools are easily bent and stripped trying to move a Kimber rear sight. I had good success using a very strong vise with a block to avoid deforming the slide.
NOTE: Some Kimbers (C-II included) are removed from the OPPOSITE side that you would on a Colt. Please see rear of disassembly manual for instructions for your group. (The machined dovetail/sight interface tightens progressively intentionally. You don't want to machine this thing, just remove it!
When the slide is firmly located, grab a nice surface-hardened steel punch and a 8 to 10 oz machinist's hammer. Place the tip of the punch carefully on the flat of the dovetail of the sight, and let 'er have it. I mean, hit it HARD. Three or four strong hits are required to get it moving. Once it begins to move you don't have to hit it as hard (I know, obvious but had to say it).
Once the sight is clear of the dovetail, clean the machined area thoroughly with a good flat edge to remove excess loctite prior to installing new site.
