Scrolled through the whole thread, and was surprised to see no photos from A 28mm F2, is it not popular or just rare?. Just acquired this lens recently and already have a history with it. Anyway, these two were quick photos before I took the lens apart to lube the focus, which was very stiff - took me like a month to put the lens back together, very tricky bastard indeed.
Very good sharpness wide open, may be even better than my K 28mm f3.5. But I don't think I'd make a good portrait lens, too much curvature and the bokeh is a bit wicked.