Underexposure Tendency of K10D and K100D

Last time when I was trying to find some new DA* sample photos, I came across the following nice and interesting sample photo gallery by a K10D user, who have shot and posted quite some pairs of pictures with different Pentax lenses on his K10D:-http://www.pbase.com/tcom/k10dWell, when I inspected those comparison shots between the DA* 16-50 against the DA 16-45 as well as those of the DA* versus