Okay I just bought FoCal, and it is telling me that I need +12 for this same setup (1DX and 24 f/1.4 LII), versus +3 using LensAlign. I tried it twice at different distances and it came up with the same result. By comparison, all the other lenses I tested came in very close to the LensAlign result... this was the only one that differed by more than a few points. Unfortunately there is not enough data on the FoCal website to compare this result with others just yet. But checking the results with the 5D3, most of the tests came in between +5 to +10. The furthest outside was a +15, indicating a very rare result indeed. On my 5D3, the lens came in at +7. So there might be an issue with this lens and the 1DX body, for some reason.