My two favorite lenses for that system was the 28mm (my favourite angle of view anyway) in either f2.0 or 2.8 and the 35mm f1.4. I really liked the 28mm 2.0, but the 2.8 was a great little compact and sharp lens that gave a nice 3D "pop" effect. However, my bread n' butter was the 35mm f1.4. I can't say anything bad about that lens -it was magical. Highly versatile, some of the best quality 20x24 enlargements I've made and a very nice signature.