I've been checking this lens since its announcement 3.5 years ago.


Heard about many focus-shift issues (while some say back-focusing issue that I think it's misleading) that are caused by the lack of floating elements to correct spherical aberrations -- hence by design.


This makes me hesitate to get it because I plan to take advantage of its short minimal focusing distance (so I can get nicer close-up on subjects) with the possibility (depending on creativity) to stop down a bit to f/2 or f/2.8 (although I primarily want it wide open at 1.2) -- all these will put it into the danger zone of focus-shift.


Some people said Canon will improve the more recent copies by having better quality control during manufacturing. Some said it's irrelevant because the issue is by design. [:S][*-)]


Anyone has some recent first-hand experience? Thanks in advance!