I have a Fender 5 string MIA standard jazz with the original passive pups. When I go to the shop and try a 4 string MIA on the same amp than mine, it seems to me that it sounds better, and I get a much better agressive growl than with my 5. Unfortunatelly, they don't have a 5 string I could compare with, so I don't play one right after the other, and don't play them in the same environment. Is it me, or is there a noticable difference? If there is one, I suspect would come from the pickups, since it is the main difference between the 2 basses.