I have the 40/2 Minolta CLE. It is a terrific size; smaller than a 50mm Cron. The CLE optic has a easier to find 40.5 thread and has modern coatings. Minolta made no bones about trying to imitate the German optics in OOF rendering while have more even performance from center to edge.

I have a perfect collapsible Cron which draws the image differently than the 40 or a newer Summicron. The 50 at f/4, upclose, makes wonderful portraits. You get creamy/dreamy background bokeh, sharp outlines/details, and a circular iris. If the OOF picture area is important and the lighting bright, I often take the Cron.