But as you mentioned, "...impacting the the look..." , its all about CoC, which depends upon multiple factor..
There is one more catch... (these are words from second link)...
Of course the actual image sharpness at the DOF limits is degraded by diffraction, lens aberrations, film properties and possible lack of film flatness, so the overall sharpness at the DOF limits will be inevitably worse than the simple circle of confusion would indicate. For this reason alone, the standard for setting the circle of confusion is a bit loose.
The thread seems to have bogged down in technical correctness for a bit, so how about some more examples of the OMZ 90/2's neutral blur property to restart it?
Cornflower is at f/2.8, little mushroom at f/5.6. Both on a 4/3" sensor.
It looks like you have some focusing calibration to do. It can take a bit of work getting the manual focus sorted out but its worth it for this lens alone...
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