When I was playing around with 35 mm lenses I found the best lense quality to be in order(best at top): 1) Hassleblad(sp)(yeah like I'm that good) 2) Nikon(really didn't notice too much difference from Oly.) 3) Olympus(had one) 4) Cannon(had one) 100) everything else. Including minolta(got one) After Nikon you were getting out of the professional range -after cannon you were getting out of the semi professional range. So before you buy, consider lense quality. It should be equivalent to Cannon or better.