Lens comparison test on *istD

This chap's done a good here, you can see the differences between lenses and file formats and also between cameras.
I think it's a pretty comprehensive review of the equipment he had available and he's provided a significant amount of detailed information - check out the various links at the bottom of the page.

A couple of years old now but well worth a look if you haven't seen it before.

http://www.dariobonazza.com/t04p10e.htm