...I would say the lens is extra sensitive to correct focus.
This makes no sense to me. The Otus has the longest focus throw of any lens in its class (possibly any lens in the 35mm format?). Consequently, it provides the user with finer control compared to alternative lenses because a greater rotation of the focus ring is required in order to achieve focus. Alternative lenses with reduced focus throw will provide coarser control. Therefore, the latter is by definition more sensitive to focus than the former.
...I don't mind doing a double post (and will if someone requests this)
I for one would be very interested to see your results.
I will report that the copy of the Otus I have appears to lack contrast most of all especially compared to my 85 1.4G.
Again, this makes no sense to me. Setting aside the difference in focal length, the Otus measurably
returns greater contrast, coarse and fine, than the computed
MTF of the 85mm f/1.4.
The only way I can imagine an image from the Otus 55mm f/1.4 will look "flat", i.e. clearly lacking in contrast, is if it was shot in low contrast conditions such as on an overcast day, in which case every other lens would perform similarly. That, or the sample you have is poor, but while that may be possible, the probability surely is so vanishingly small as to be all but impossible.
...I've decided to shoot some studio comparisons closer up than what I've done up to now in hopes that some magic will happen. (I will have wine then!) And I will post the results.