I've been using the Minolta CE Rokkor for a while now, not sure if anyone else has experience with it. Along with some small, but frustrating alignment problems, I've never been hugely impressed with the sharpness of this lens - even at my small standardised print size of 6". Other than high quality reproductions of medium format images however, I have very little to go on in comparing the definition of my prints - theoretically my images could be much sharper than I have the experience to determine. Does the Rodagon have much higher quality optics than the Minolta? Will there be a noticeable improvement in sharpness if I upgrade to this lens? My other option is the Schneider Comparon-S 80mm f4.5. Thanks.