So I love my Konica Hexanon 57mm f1.4 lens. Great portrait lens. I feel that my other lens, the Konica 40mm f1.8 is good, but doesn't have the IQ or sharpness of the former. Still a pretty good lens, but a little too soft. So the question is, should I still keep the 40mm? If I should sell it, what's a good alternative lens around the 30mm to 40mm that I should get?