After reading this answer for another post:
I don't mind the vignetting as it actually improves the look of portraits however if you're doing astrophotography what's the point in a lens that's f/1.4 in the centre and f/2.0 at the edges? Having said that vignetting is not really a problem with a crop camera.
I was wondering if astrophotography is really the only reason that one should be concerned about a lens that has strong vignetting. If I am purchasing a wide aperture prime lens such as a 50mm f/1.4, 85mm f/1.2, or a 135 f/2.0 that will primarily be used for wide open indoor portraits - is vignetting a non concern?
Answer
If you shoot raw and run all of your photos through something like LightRoom then it's one of the more minor lens defects as vignetting correct is very easily applied, and you'll probably find you only need to correct some images.
You have to ask yourself what the alternatives are. Vignetting is a feature of wide aperture primes some are worse than others but at the end of the day you're comparing two different levels of vignetting, if you don't want it you'll end up correcting images regardless of the lens you choose.
I would look at other factors first (price/aperture/sharpness) and not worry unduly about vignetting.
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