I've been vacillating lately between getting a Protar or another Tessar. They are both of the same period, but have somewhat different designs. Here's my question. Will I notice any difference between an image made with a Tessar vs. a Protar? Anybody can see the difference between images from a Petzval and a Tessar, and a Dagor from a Heliar, but is there much (if any) difference between a Protar and Tessar?