My muse is back! Yes, Mr. Hawk payed us a visit today. He came to cool his feet as you can see. I took 88 snaps. Various combinations of 100-400L and the 70-200L with and without the 1.4x. This one is with my 5D3, 100-400L+1.4xiii - so @540mm. 1/320, f8, ISO 320. I have not wiped off the EXIF so you can examine it.
I am entirely satisfied with both the lenses with and without the 1.4xiii. I have noticed that when the pictures are not sharp it is due to shake. AFMA values with and without the 1.4xiii is the same for both lenses! So AFMA of the 1.4xiii is 0. I am happy.