I just received two 50mm f1.4, one very rare and another very common:
The first one is the Carl Zeiss Jena Prakticar 50mm f1.4, a marvelous piece of glass:
I've never seen a lens with such curved elements, they are so spherical because the designers tried to "compress" the large Pancolar 55mm f1.4 in a tiny package:
Supposedly, it also has a thoriated element like a SMC Takumar, but this one is not to yellow...unfortunately the high price caused the demise of this lens along with many other CZJ lenses for the Praktica B model that were designed for professional use, but the pros of the era didn't take Prakticas seriously and beginners couldn't afford the price something in the league of the Carl Zeiss West Germany for Contax.
The second one is a Rikenon 50mm f1.4 XR, also very beautiful lens, definitely bigger and more conventional in its design:
At the moment it's on my LX but I am expecting a XR2S...I'm curious to see how it compares with my Pentax 1.4s.