VictorLouis,
It is thinner, but not a great deal thinner. I just find the K9 grip to be the second best feeling grip (right behind a Hi-Power with GOOD grip panels) I've ever wrapped my paw around.
The slip-on might help, though I can't say that I really care for the finger groves.
They didn't have an Elite model to compare to and my K9 was loaded on my hip...so, based solely on my dry firing the Polymer gun I'd say it was the standard trigger.
Two more things, other than the grip, that I don't car for are:
1) The mag release is made of polymer. I had some trouble when inserting the mag. I'm sure it would be better after a number of insertions to break it in. What worries me is that after it is broken in, will it keep on wearing and then fail to lock a mag in place.
2) The balance of the gun is all wrong. It's muzzle heavy. I'm sure a loaded mag would help, but that's the wrong way to balance a gun. The weight of the loaded mag shouldn't hurt the balance, but it shouldn't be relied upon to give the gun proper balance either.
I like the all steel K9. It's not too heavy. It's easy to shoot with very little recoil, even with hot loads.
I've gone the lightweight carry gun route before and it's not path I care to sprinkle my money down again. I like to shoot my guns and the light-weights are not comfortable to shoot for more than a brief period.
Just my very humble opinion and it's not meant to belittle Kahr's efforts. They have made a nice gun for those who decide that they want a lightweight version of one the best handguns available.