I received my Canon EF 16-35mm f/2.8L (original version) back from Canon service (see April 5 blog entry).
The notes state “REPL ELECTRICAL PARTS, ADJUST HELICOID, AUTO FOCUS, M FOCUS, CLN”. Given that this lens saw minimal use and is in mint condition, I can only conclude that all these problems were out-of-the-box issues. Poor quality control remains a common occurrence even with expensive “pro” lenses from Nikon and Canon.
Given the unexpected and excessive chromatic aberration with my new EF 16-35mm f/2.8L II zoom, I decided to also sent it into Canon service. When it returns, I’ll retry the comparison between the original and “II”, with my fingers crossed that my sample is/was out of whack.