I always like my Carl Zeiss Jena Pancolar 50/1.8 lenses, especially the late model for Praktica B-series. But in terms of more "mainstream" ones, I always find manual-focus Minolta very dependable. Bokeh afficionados consider the old MC Rokkor 58/1.2 as the benchmark, but I rely totally on my "lesser" late-model "plain MD"s: 50/1.7 and 50/2 for all sorts of jobs and in the full knowledge that I can count on them to deliver the goods, both for me and my clients.