Well, I can't speak of the Kahr but can speak of the Kimber. I carry an Ultra CDP.
To me, there is no better choice for a single action carry in a .45 than a light weight 1911. The Kimber weighs 25 oz empty (I did weigh it loaded but forget that number). It does recoil more than my 5" Classic Stainless as I would expect it to; still I find it contollable and accurate at combat distances. I've never benched it at 25 yards to check for target accuracy.
For extended range sessions, I'll take the 5" gun. It definetly is less strain on your wrist!
I find it too large for pocket carry. If I am going out & need to have a pocket gun I give up caliber & carry a Colt Mustang in .380ACP or, for even tougher CCW, a KelTec P-32. The Kahr may allow major caliber carry in a wider variety of situations with clothing a consideration.
Finally, there is the SA & DAO thing to consider. I'm a better shot with SA, although admittedly have not shot DAO nearly as much.
Hey - do like Mike in VA did - get both!