The new Meprolight sights are much brighter than the ones used on the "Series I" Kimbers. They're probably the only part on the new Kimbers that have improved, though.
What is the problem or what is wrong with the Kimber Series II of CDP pistols?
The fit, finish, and reliability of the parts they use. They don't actually "fit" any parts to the gun. They're all poor quality CMC "Easy Fit" MIM parts.
1) I had a poorly manufactured slide stop that was out of spec, causing the slide to lock back every couple rounds. Wound up replacing it with a Wilson.
2) Had a poorly manufactured mag catch that allowed the mag sit too low in the frame, causing failures to feed. Normally this wouldn't be a problem, but Kimber cuts the mag catch holes in the frame so much bigger than the mag catch that the whole thing sits too low in the frame. I replaced it with another CMC mag catch which broke in half after about 300 rounds.
3) Had several failures to return to battery caused by the Series II firing pin safety plungers colliding. Maybe if they took the time to radius the plungers that kind of stuff wouldn't happen.
If you hold a new Kimber next to an old one of the same style, you'll see the difference easily. The "Series I" guns are properly machined, accurate, reliable, beautiful, and reliable guns.
Foolish me, I was expecting that kind of quality from the Series II guns as well... I guess $700+ doesn't get you what it used to.