Quick comparison between Minolta 50/2.8 Macro RS and Minolta 50/1.7 Original.
Photos of a newspaper on the wall were taken with A700 on tripod and 2 sec timer at f/2.8 & f/4 (plus f/1.7 for the 50/1.7). In the center there is very little difference of sharpness. On the 50/1.7 the right hand side is less sharp, but that's probably just a problem of my copy. There is pronounced vignetting with the Macro @ 2.8, which is absent on the 50/1.7 @ 2.8. At f/1.7 the 50/1.7 vignettes about as much as the Macro @ 2.8.