I am encharmed with this lens. As You mind to see, it is very sharp wide open. It has amazing color rendering and legendary bokeh..I hope I a few more photos with this lens.
(Why Biotar 2/58 is discontinued but eg.Sonnar 1.5/50 is still manufactured? I know that there is close construction like ZM Planar 2/50, but it is shorter than short-tele like 58-60mm (87-90 eqv.) and more symmetrically designed..moreover, it still doesn't have that kind of bokeh). IMHO Biotar 2/58 is best Carl Zeiss Fifthy for Nex-7