Here is one from the 28mm f/2.8 AIS @ f/4 on D200. full resolution if opened in new tab. It was possibly captured though a window though so the quality of the window glass comes into play. My impression of this copy of the lens is that performance is really good near wide open all over the frame, also near infinity. I later tested a copy of 24mm f/2 AIS, which probably resolved a little better in the center, but had really poor edges even stopped down.
The D200 is a DX camera, so it is difficult to evaluate corner performance based on this pic. all F/C/K/Ai/AiS 28mm lenses (2.8 and 3.5) have FF coverage.
I have the 28mm/2.8 AiS (1981, with CRC), and my own experience with it is positive at all distances, haven't used it lately but I chipped it, so it may come into play very soon...
Ciao from Massimo