In my opinion the modern Summicron is to contrasty. Too much of an edge to the look. In color it produces beautiful saturated colors. In black and white there is too much contrast for my taste. I had a modern Summicron and traded it for the Dual Range version which is the version just after the Collapsible. I like it better. I also picked a collapsible but have yet to develop the pictures.
In the darkroom just adjust until you like the look whatever the final contrast setting turns out.