I have, as someone else mentioned in this thread, noticed a change to what my MA settings needed. MY 24-105 and the 135L for instance. The 100-400 seems the same, but it was on zero anyway before. I had to drag back the 135 about 5 points from around +3 to -2. The 24 had to be moved about 4 points. Having said that, my 24-105 is now the sharpest it has been so it may have been a slight miss originally when Ma-ing, and the 135, well it's always sharp anyway!
my first thought was that unless they all had be shifted by the same amounts, then it must have been my original MA job was off, but before the upgrade the 135 was definitely on the money at +3, as soon as I upgraded it was noticeably off and I had to go the other way past the zero point.
No biggie, but just throwing my findings out there.
Thanks for the upgrade canon, kudos to you! Of course they could have done "more", but realistically they didn't have to do anything.