@bland I received several news lens earlier this month and I am having the same issue. I thought I am getting old and just not as strong as I use to be. A couple of guys that I shoot with came to visit and I told them about this issue and every one of them struggled to get the caps off and the 24-70 no one could that one off. They are a lot younger and stronger than I am and we concluded that they must have changed vendors and there spec's are off.
I recently got a new lens, that has a new lens cap, but I haven't noticed it sticking to anything really. That being said, I've always set the cap on another lens, never another surface.
I agree about the threading but something has changed with the new lens caps. I removed the lens cap on my new version of the 70-200mm G lens and tried the lens cap from my 85MM D & G lens and they went on and came off with no problem. I tried the new lens cap on the 85mm lens and had a heck of a time getting it off. I took the lens's to a my local Camera store and they had the same problem and said they had a number of people complaining about the same issue.
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I recently got a new lens, that has a new lens cap, but I haven't noticed it sticking to anything really. That being said, I've always set the cap on another lens, never another surface.
I prefer the new caps as they're tighter and do what they're supposed to do. Too bad I only have 1 of the new caps and 2 of the old ones.