Another element here is development and film stock. B&W films show less vignetting than color negative films, which show less vignetting than positive slide films. With ultra wide, high vignetting lenses for large format, you'll often get recommended to use a center filter to correct vignetting on color film, but then turn around and use the same lens with black & white film and not need the filter at all.
Then with development. A compensating developer will obscure vignetting more than a noncompensating developer because compensating developers tend to regularize contrast because the developer is exhausted in the highlights, which in turn reduces the development reaction rate in the highlight areas, so if you expose for the shadows, you'll balance out the vignetting relative to the highlights, too.
Wish I could say something about the actual chemistry involved, but...
