I have a few older 50 and 55mm lenses for manual focus bodies.
50 /1.4 AI, 1977, Dreamy at 1.4, sharpness increases after f/4, very sharp at f/8 and 11.
50/2 AI, 1979, Sharpness increases when closed down but it is sharp from corner to corner from f/2 to f/11, but never sharp as 50/1.4 AI at f/8.
50/1.8 AF-D, 2009, plastic made in China, basically this is an AIS lens, dreamy at f/1.8, sharp at f/2 to f/4, very sharp at f/8, this is the sharpest lens I have, however sharpness decreases at the corners compared to 50/2 AI.
55/3.5 compensating micro Nikkor, non-AI, 1967, extremely sharp macro lens, even not worse than 50/2 at distance. Mine is AI’d by #63 kit.
55/3.5 PC, micro Nikkor, non-AI, 1974, Very sharp macro lens, can be used as an overall standard lens, and very good at distance.