I don't see a ton of difference
I have three Springfield Armory 1911's (Full Size A-1, 4" Champion and EMP in 40 S&W). I have a Series 80 Colt full size and I have a Kimber Ultra Carry II. While all of my 1911's shoot well, I've NEVER had a jam in my little Kimber and it's deadly accurate. My son just bought the same pistol and his is accurate and goes bang-bang-bang every time so far too.
I think you can get lemons by any gun manufacturer, so it comes down to will they help you turn it into lemonaide or not, right? I've not needed help from Kimber, but if they have a non-responsive customer service department, that would be an issue.
Regarding "customer service" - I'm on several forums including a popular archery one and I've seen people bash companies for their service who have given me nothing but awesome customer care. The point is - beware of any and everything you read on the internet! (DUH!) I think a lot of times it depends on how a customer service department is approached. Come on like a jerk and they might treat you like one. Come on courteously and you might be met in kind.