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I recall Nikkors 28/2.8 and 28/2 being discussed but can't remember which performed better..
You might find this comparison of corner performance at infinity for the 28 f/2 AI-s and 28 f/2.8 AI-s NIKKORS useful:
The conclusion of which is that the 28 f/2 AI-s has much better corner performance at infinity. My other testing of the two lenses confirmed a few other "knowns" about the lenses: the 2.8 has a more pleasing bokeh, while the f/2 can be a bit busy, not unlike the 35 f/1.4 or 50 f/1.2 AI-s NIKKORs. Up close the 2.8 is king: closer focusing (0.2 vs 0.25 m), and crazy sharp in the centre of the frame. The f/2 isn't a slouch up close either, but I preferred the 2.8 in part due to the bokeh. It's also slightly more compact, and WAY easier to find in good condition used for a reasonable price.
FWIW, I ended up keeping the f/2.8 and getting rid of the f/2.