Anbesol: In photoshop I zoomed inn until screen indicated 100%, then did crop what I could see in the screen. The size of this was 1800 x 1200, so I rezised to 800 x 533 to be able to post.
Canuck, The crop was from the center of the picture.

Thanks for your input, now I know why I like the lens so much.

Mette, sorry for stealing your thread, I hope the observations help you check your lens. And even though my lens has the "defect", you can see the pictures that it takes:

Click image for larger version.  Name: DSC08050-em.jpg  Views: 146  Size: 121.5 KB  ID: 67529

Click image for larger version.  Name: DSC06624-em.jpg  Views: 119  Size: 221.0 KB  ID: 67530