I have a MK9 that I carry sometimes.
My usual CCW is a 1911, which conceals well. But depending on a couple of variables I sometimes choose the Kahr.
1) Weather: I worry less about sweat with the stainless MK9. and
2) Clothing: The MK9 conceals better under a tight t-shirt or when I need to tuck in a shirt. (Galco King-Tuk holster)
Like others have mentioned, it's really pushing the envelope for pocket carry. It's dimensions are on the large end (for pocket carry), and the weight makes my pocket feel awkward. I have pocket carried it, but not many times.
Aside from CCW, the MK9 shoots well with a long but smooth trigger and the weight soaks up recoil like a full size gun. I bought mine used, with Wolff extra power springs, so I'm not sure what its like to shoot stock. I will say that with the extra power springs my wife can't rack the slide reliably. Shooting it, however, she can do and likes to do. She does not like to shoot any light-weight pocket-size pistols, even ones in .380, because of the snappy recoil. But the MK9 has a very manageable recoil, at least partially because of the weight.