So, I wanted to see if the 5cm 1:1.4 S.C RF chrome and the black one were keepers.
So I ran some test shots (I don't test lenses, just wanted to know if I have a good copy).
I took photos of a wardrobe, with a photo print in the center, at 1.4, 2.0, 2.8, and 4.0 with the 5cm S,C S mount chrome, another one in black, the millennium and a 50mm 1.2.
Lighting was window, soft light, hard light might show more differences among the lenses. Other distances and subjects would give different results, not a test, but a check on a tripod..
I will not make this a long post, if you are curious, it is all at Flickr, well labeled.
My evaluation is that the 5cm Chrome is a good copy, the 5cm black is a little better, the 50mm 1.2 is much better, and the 50mm Millennium is better than the 1.2 at 1.4 (both). from 2.0 up the 1.2 and the Millennium are pretty close.
Statement of fact, the Millennium is as good at 2.0 as the old lenses are at 4.0. Worst distortion may be the 50mm 1.2.
Here is a photo from each, labeled and at 2.0. small size- if you are interested go see the whole series in Flickr. All processing copy paste.
The coatings and internal reflections, the 5cm black has better coatings that the chrome, the Millennium much better.
I guess I will keep them all.
The Fotofox S to L39 adapter is not as good as the incredible Amedeo S to LM, but it works well and it was only $70, not $300,