A tad heavier, better fit and finish, much better trigger, real sights, slide locks open on empty mag... Think of it as a scaled-down version of any full-size Kahr.
Oh, did I say the trigger was really, really sweet?
I LOVE my Kahr CW40. It's bigger than the pocket sized Kahr's so I have alot more comfort with it in my hands. I just wanted something nice and slim that's concealable, reliable, and it covers both fields very well.
Kahr may not be as well known as Glock but it certainly lives up to as good of quality to me.