I have changed my mind:
On the k20d it's better but not good enough. National Camera Exchange graciously exchanged 9022145 for another one 9013510
9013510 on the k20d definite CA problems with high contrast edges. Don't you just love purple fringes. I snapped a couple of shots inside the store and both the sales person and I thought overall focus was better, exposure issues seemed better so ok we swapped lenses. Walk outside to the car, it was cloudy gray day, snapped a couple of shots of trees in their yard and one of those shots included a corner of the building. I get back to my hotel and copy the images from the camera to the laptop and what do I immediately see? Purple fringes on the corner of the building.
I must check to make sure the building doesn't actually have purple fringes when I return this lens.
Originally Posted by dlr1989 
9022145 purchased at National Camera Exchange in Golden Vally, MN:
k10d not so good
k20d very good