The effect of optical vignetting on OOF regions is a different phenomenon than the reduced sensitivity to obliquely angled light. The former applies to film and digital sensors, whereas the latter applies only to digital (and differentially affects sensors based on pixel size).
It is the same, if we are talking about the same thing. The OOF highlights in the center do not suffer from vignetting before registered by the sensor. Close to the focus plane, it may have bright edges or darker one, depending on how the lens is corrected but that is something else. Digital sensors would render a uniform disk to one which is darker towards the edge. You can see that in KR's shots but part of this might be due to an under-corrected design. A good test would be to take a few shots with different defocus and compare.
BTW, film is not as ideal as we may think in that regard. Partly reflective surfaces reflect more at oblique angles and even if they do not reflect much, they transmit less unless they are coated. How visible this is on film - I do not know.
Now, if you are talking about the effect of vignetting away from the center - then this is lens and mirror box induced, creates cut highlights, etc.