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It is all need for speed, especially at ISO35. I likely will get both FL's but was not sure the Canon or Nikon mount was better for a tech cam.Yes, the Otus 55mm has been tested on the Alpa FPS of course. (and I own both, but just use the Otus on my A7R). The IC is not very big - just enough to cover 35mm FF really, with little to spare.
Why might you want to use an Otus when we have the 90mm HR Yellow band? (which I also own, gear slut) Answer: for the speed and aberration free super resolution at f1.4-f2.8. The 90HR starts at f5.6, of course. What is special about the 90HR is the amazing resolution across a big image circle, great for stitching and shifting. It is not really showing its best qualities on a straight shooting FPS, it's jaw dropping on the STC, MAX, XY, etc.
When an MF back with EVF-out jack and great live-view arrives, I might try again with the Otus on the FPS. I suspect the new 85mm Otus covers little more than 35mm frame too - but would be very happy to be wrong.
Did the 85mm cover the IQ180 IC?I put the Otus 85f1.4 and the ZE 135f2 at Photokina at the Zeiss booth on my FPS with IQ180. The ZE135 image circle is somewhat larger than the Otus 85, both should cover the 44x33mm of the IQ250 sensor. I can't say anything about corner sharpness because these really only were handheld shots to roughly check the image circle.