yay! great news. my replacement that I got back in June is also an October 2012 copy and is an absolute beauty very sharp at both ends of the range, 0 AF microadjustment needed etc..
Terrific! Glad the earlier batches seem to be working out for a few of us here. I still wonder what Canon did with the March 032 batch that caused all this.
i don't think the one that i replaced back in may with the clicking sound was a march copy. i seem to remember it had a february 2013 date code. so don't think the problem is confined to that march batch.
i feel for those who have this problem. yes, as someone pointed out they are still fine optically but being the fastidious type of person that i am it would annoy me every time i used it.
surprised that a few here are still able to get 2012 replacements. great news but that can't go on forever...obviously. just hope canon will be looking in to changing this for future production.