In article <324de4e3.2490587@nntp.knoware.nl>, leover@knoware.nl says...
>>>I would like to hear opinions on Nikon's 50mm or 55mm f1.2 lens
>
>>Both are excellent lenses. the 50 is better at 1.2 than the 55, but the
>>latter is cheaper. Most likely you will not use it at 1.2 very often.
>
>>The barrel on the 55 is very thin, so be careful about buying one which
>>has been knocked along the barrel - it will most likely significantly
>>affect the lens. I have owned a very early 55 which was AI'd by Nikon,
>>and replaced it with a non-AI'd early version which I still have (I'm a
>>collector). Both were very good, though lower in contrast than the 50.
>
>Thanks Peter,
>What about the 1.2 58 mm in comparison?

I have used Nikkor f1.2 50mm, 55mm, and 58mm lenses. The old 55mm design
was not bad, but definitely not wonderful. Edges and corners were not
up to Nikon normal. The 50mm is really excellent wide-open, but over
a fairly limited focus range (mid-close distances), with relatively
poor edge/corner performance near infinity focus compared with the slower
50mm's. The 58mm f1.2 aspheric that I tried was a disappointment, and I
lean toward the theory that the sample was defective. Performance at
apertures wider than f5.6 (where it was superb) was noticeably poorer
than with any other Nikkor normal that I have tried.
Hope This Helps