Some people have been asking how this lens performs at the edges. Well, I was at the beach this weekend and I took a snapshot from my hotel room of the hotel grounds. I uploaded the picture to Zenfolio in original size as a jpg and made it accessible for download. It was shot at ISO 200 1/800 hand held at f5.6. Again, just a snap shot but there is stuff there to dig into if you want.
just hover over the photo and a menu will come up where yo can download the original.
The focus area was near the white chair in the center.