I recently posted these at full frame as part of a comparison exposure test, but thought they might be relevant here as a contrast/color/sharpness test...
All shot on Canon 30D @ ISO 1000 @ 2.8 jpegs out of camera @ max sharpness
They are the 50mm F1.4 AIS, 50mm F1.4 S, and 50mm F2 H ("K" version with rubber focusing barrel)
Results are very similar...a bit different in brightness/contrast at different parts of the spectrum (e.g. the "S" seems brighter on the near 18% gray in the background)
...and the "H" is stopped down only 1 F-stop whereas the 1.4 50s are down 2 stops...
All pretty impressive I think...and any variation would be more a result of user technique, whether focusing or exposure...
Nikkor 50ais1.4 100%Crop
Nikkor 50s1.4 100%Crop
I have or had AI/NonAI versions of the 50/1.4, 105, 135, 180 and 200 and they are all quality lenses...varying in their size and mechanics more than in their results...to my eyes at least.