I have run series with the various 55mm Micro-Nikkors at infinity focus and see no reason to rephrase my earlier statement. This not to say the earliest 55/3.5 is bad at infinity, only that it is less good than the later versions. I prefer an early AI at present as it is less temperamental regarding focused distance. The 5/2.8 improves in general on all the f/3.5 models in most aspects, possibly apart from image contrast.
The post is somewhere here at NG. You might search for it.