I just purchased a Nikon S2 with a 5cm/1,4 that has 12 blades but I haven't had the chance to use it yet. I do have to add my thoughts on the Minolta Auto Rokkor 58/1,4. This lens gives the creamiest bokeh that I have ever seen from any lens. I have a few examples around here somewhere that I will try to post. But in the mean time check out the Rokkor files for comparisons of Minolta lenses and the bokeh they produce, you may be surprised.