Shoot all day?
Well, I put 100 rounds through my P11 usually and it don't bother me at all with standard WWB. The +P stuff rocks you back a little more. Yeah, the KT is the lightest of 'em all, so stands to reason it has a little more recoil, but it's not as bad as +P .38s in my alloy .38. That thing kinda stings my hand after a couple of cylinder fulls. Of course, then, there's the .45 Colt with hot loads in my contender if I really wanna be masochistic. Haven't bought a .45-70 barrel, yet.
The new PF9 is 2 ounces lighter than the P11, so it might be the new king of pocket recoil, .40s and J frame .357s excluded.
I would expect the Glock to be a little easier, heavier, larger gun. The little Kahr, well, I haven't fired it. It's very close to the KT in size I think. But, in NO WAY are ANY of these little guns at a level with a Airlite J Frame in .357 magnum! Even the KT is quite controllable in rapid fire and the flash bang is nowhere close to .357 levels out of a 2" gun, so I guess everything is relative. Neat thing is, the guns are smaller, light, pocket sized, and pack as much as 13 rounds of +P which out of these guns is pretty close to the hottest .357 loads out of a 2" gun. You just can't beat 'em for pocket carry firepower IMHO. And, my P11 is quite accurate, to boot and I'm sure the baby Glock is, too. To me, they're the perfect answer for serious all day CCW. IWB gets uncomfortable after a while, even with a light gun. I like to pocket carry unless I don't have a choice.