Erwin Puts reviewed it in comparison with the collapsible Summicron, and found that they were in general rather similar, though the Summicron had more even sharpness across the frame, whereas the Summitar was sharp in the centre but softer in the corners. Stopped down the rendering seems quite modern, though this is a 1930s design. The Canon 50mm f/1.4 LTM first caught my attention quite by accident, whilst researching my purchase of the Leica 50mm Summilux f/1.4 Asph FLE I stumbled upon references to a lens some referred to as the Japanese Summilux.
Wide open it has a bit of character, with signature 'swirly' bokeh. This lens was supplied as a standard lens of Leotax from 1957 to 1985. Mine happens to be coated, but I don't know how much difference that makes. The Fujinon 5cm f/2 is a rare lens released in Japan, nowadays commonly known as Fujifilm or Fuji 50mm F2 lens offered in original Leica 元9 screw mount with rangefinder coupling capability. I have not found an in depth review of the SUMMITAR on the internet which may indicate it is an inferior lens.
The SUMMITAR is not coated however I believe that with the barn door lens hood which I have it would be good for black and white. It has always been the reference against which the rest of the. Leica Summicron 5cm f/2 Rigid has a slightly revised optical design from its collapsible predecessor, still with 7 elements but with superior performance. I have a 50mm f2 SUMMITAR and don't know how this compares with the two mentioned. Leica has made the superb LEICA SUMMICRON 50mm f/2 lens in several iterations since 1953.