Can you provide more detail about this AFMA error?
Sure. Occasionally the camera sets the AF Micro Adjustment to -8 which results
in images that are out of focus. If you notice, you can reset it - until for no known
reason the camera sets it to -8 again.
It is a problem that might or might not occur the next day, and it is hard to see
on the back LCD display.
So, as a wedding photographer I might shoot a whole wedding with unsharp
images and only notice after it is too late. Not my option.
There have been reports of people suffering from that error ony after downgrading
from 1.2.1 to 1.1.3 again, and not having this problem before up/downgrade.
I had the problem from start, and 1.2.1 fixed it. So I am not going back to 1.1.3,
I will have to wait for ML to be compatible to 1.2.1, whenever that will be.
In the meantime, my 5D Mk3 sees little video work, most is done on the 5D Mk2.