Not "vignetting issue" as such, rather a too small image circle by design. These lenses were never intended to project an image circle large enough for FX/24x36.
From the similar experience of DX Nikkor to FX Nikons, while you get a larger image circle by stopping down (for some of them), image quality outside the designated format coverage tends to be very poor. Again, hardly surprising and nothing one can hold against a given lens.