Well, I did the first comparison shots between both DFA 100/2.8, the WR and the non WR version.
(Warning: by clicking on the shot, you get to the full resolution photo)
K-7, f/2.8, 6s, 100iso
DFA 100/2.8
DFA 100/2.8 WR
K-x, f/5.6, 1/60s, 200iso, AF160FC
DFA 100/2.8
DFA 100/2.8 WR
K-x, f/11, 1/60s, 200iso, AF160FC
DFA 100/2.8
DFA 100/2.8 WR
K-x, f/8, 1/60s, 200iso, AF160FC
DFA 100/2.8
DFA 100/2.8 WR
All these shots are also under
DFA 100/2.8 vs DFA 100/2.8 WR - a set on Flickr
It is quite difficult to get the same focus point when changing the lenses. I tried the best to get comparable shots. I do not really see differences between both lenses, apart from slight different focus points.