That's why I bought a 638, you can see my thumb on the hammer spur. You'll have to forgive my poor trigger discipline. 
“S&W 642. You heard it here first. :)”
Besides being bigger than the Kahr, having less capacity and slower reloading, I just dont like hammerless revolvers. People buy them for being “snaggless” but I have never snagged a snubby in thousands of pocket draws. Just keep your thumb under the hammer spur and it is impossible to snag. Why anyone would want to cripple a revolver and eliminate its most accurate mode is ridiculous IMO.
That's why I bought a 638, you can see my thumb on the hammer spur. You'll have to forgive my poor trigger discipline.