In an ironic twist, my problem went away once I turned AFMA off.Same here ... disabling AFMA worked for me when I used 5D3 with the 25-105 f/4 L lens ... but all of my other lenses work better with AFMA enabled
That just means the 24-105 is a good match for your 5DIII. You just set Adjust By Lens and leave the 24-105 at zero. Personally, my 85L II and 135L require no adjustment on my 1D X, my other lenses do.
Just got the Reikan Focal PRO i just did the camera/adjusted(all) haven't tried the lens yet, does it give you the same results? just wondering if they'll have an update so we don't have to manually set, but otherwise it's money well spent.