As promised
here, I did a quick comparison between these two lenses. All shots were taken handheld in JPG by K20D, AWB, no post processing except resize. A more scientific test should be done w/ a tripod and better lighting control, and in RAW. So we can't make conclusion about which lens is sharper than the other simply based on this test
Couldn't keep my daughter steady long enough for the test, I had to do it w/ my dad instead. Photos in replies. You can click on each photo to view the original one.
IQ wise I don't see much difference from the testing results. Probably because my eyes aren't well trained ...