My 2 cents... (just the FNG)
I know I'm the FNG, and I joined really because of Kahr issues (shocker)... but needless to say, I AM a Glock guy, though and through. I own both .40 and .45 cal (23, 27 and 36) and ultimately, bought a Kahr CW40 for ccw. Here's my glockage:
G23 - GREAT home defense weapon, shoots AMAZING (have a 23c so snappiness is kinda mitigated- honestly, .40 recoil doesn't bother me anyway, I practice)... Regardless of how great the 23c's PROs are, the con is that it's plain difficult to conceal, at least for most.
SO, for CCW purposes I bought a G27. LOVE IT. same reliablilty (same AMAZING auto-trigger, which is IMHO the best thing any glock's got going for it, and of course AK-like reliablilty). YES, the G27's shorter grip is great for CCW- BUT, it's still as thick as a brick!! Also, shooting mags without pinky extensions is plain silly with mini-glock, especially .40 with that snap. Again, .40 recoil doesn't bother me, but with 2 fingers on only, let's just say it took some practice to shoot as accurately with the G27 as the G23. In fairness, I'm probably 85% there.. NOT 100... Bottom Line: GREAT weapon, but (at least for me) too thick to CCW effectively.
G36: I know you already said you're against the .45... but this to me makes no sense. IN FACT, I would sooner choose the .45 over ALL - especially if you're asking about .380!!! (Don't ever bother carrying one of those!!).. .45 is aheavier bullet, and with slower muzzle velocities has LESS snap (significantly) than the .40.. in fact, it's kinda puppy-dog like, like a 9mm. Someone already pointed out valid fact about .357 sig, but ammo's a pain in the ass to get, and I'd sooner go .45 model 36 slimline. POINT 2 re: 36 - you mentioned CCW, and slimline IS thinner.. (still thick compared to kahr tho).
Latest Pistol: Kahr Cw40. AMAZING for CCW - TINY. CW is not the micro (PM model is) what's crazy is that the CW actually has a LONGER barrel, yet SHORTER overall length than G27.... AND, you're comparing smallest glock to SECOND SMALLEST kahr.. so this goes to show. I know you aksed about Glock, but the kahr deserves a mention, because im my opinion, it's kind of the best of ALL worlds *(except trigger!): kahrs CW is kinda like taking the best of a G27 AND a G23c AND the "slim-line" ness of a 36.. all in one - AND NARROWER THAN ALL THE GLOCKS. period.
ALSO, if you have any doubts about the severity of difference in thickness, go to a store and field strip BOTH pistols - hold one in each hand and look (top view) at the frame in each hand- look HOW MUCH tinier the kahr is - without the slides on, you can REALLY see the difference.... So regarding CCW, I really do encourage you to look at the slimline .45, model 36. GREAT GREAT pistol too. And the Glock trigger SPANKS the kahr, it aint even a fair fight there.
In terms of simplicity, reliability AND a ferrocious trigger, you just CAN NOT BEAT A GLOCK. They are MADE to shoot fast, and follow up. in retrospect, I probably would have opted for .357 sig, if only ammo was easier to procure. I made my choice with .40 as my primary, and I'm happy I did- you can find .40 everywhere - you can find 9mm for a damn.. I guess it comes down to geography.