Few from Voigtlander Color Ultron 50/1.8 (m42). All wide open.
Some remarks.
The lens is sharp at f1.8, if focused properly. I did not tried it at other apertures, since it is 'auto' lens, and it requires some surgery to block the aperture pin. The bokeh is gaussian to my view, very smooth. Colors are natural.
The mechanical part of the lens is quite perfect, however. It is made in Singapore, and my copy has both rings very loose, especially the aperture one. I disassembled it -- it looks like a construction issue. If placed in a different body, it could be a killer lens, optics are just outstanding (e.g. the twin Carl Zeiss Ultron 50/1.8)