summaron
Established
awilder's analysis sounds right -- I did hear someone say the older one was "sweeter" which acknowledges that the character was slightly different. The superiority of the 35S Sonnar over the 35T Tessar was supposed to be that the 35S was sharper wide open. The out of focus handling of the both the 2.8 versions is very handsome, but seems to be rather austere and sober compared to that of the exuberant 1.5 Sonnars.