the magic number......
is the thickness dimension.....
Nobody is as thin as the Kahr @ 0.9" and go and measure one...that's the max. thickness you'll find.
I opted for a PT-111 and though I like it very much, it's thicker....the published spec. is 1-1/8".....but it measures slightly wider at points on the poly receiver.
the P-11 published spec. is 1.0".....take a caliper and measure yours and see if that holds true.
That 1/10th of an inch makes quite a difference IMHO.
Karh's patented offset feed ramp lowers the bore axis as well. And that gives more room on the grip for the same overall height dim. On the P9, I can get a full purchase with my pinky (I've got fat knuckles) and the over all height is 4.5".
On my PT-111, I can only get a half finger purchase with my pinky, and the overall height is 5-1/8". More gun to carry and conceal and less room on the grip.
I got the PT-111 because I was severely funds limited, and yet I wasn't willing to skimp on quality....and this is a quality pistol.
Never shot a Keltech.....held one and wasn't impressed, though theres a lot of people singing their praises. Overall I think the reveiws seem mixed though.
Hope to get a Karh some day......but now that I have a PT-111 shaped indentation in my a$$, I'll stick with it for the foreseeable future.
Summary....I think in the world of concealed carry....thickness and weight are the crucial numbers and once you get down to a certain "smallness", the price to get just a little smaller yet goes up significantly. Kahr gives the thinnest package, is very light and goes on the record to say they can handle +P.....while most others play the CYA game and say "not recommended"
Others know much more than I....but I'm bored and rambling.