Sorry - I have been trying to take this thread offlist and failed to check the reply address on this one. :(
FWIW I am looking to borrow a friend's camera to compare the quality of results with his prime lenses. I want to get an idea of just how much improvement I should expect before I run out and spend heaps on lenses. Is this relevent to film scanning - yes, because if I can't see the improvement when scanning at 2700ppi I probably won't spend the money on the lens! Rob