Rob-F
Likes Leicas
Take a look at this lengthy document:
https://www.zeiss.com/content/dam/Photography/new/pdf/en/cln_archiv/cln35_en_web_special_bokeh.pdf
On page 41+ it has some examples. Basically it seems you can improve sharpness for out-of-focus regions, but with other tradeoffs in image quality.
Yeah, that's what I meant. DOF is "acceptable unsharpness." So if the in-focus image isn't too sharp, then you can't tell that the OOF part is any less less sharp by comparison. It's all relative. At least up to a point.