Hmmmm. What is your shooting mode? Maybe a dumb question, but did you somehow turn on the ADV. Filters mode? The vignette almost looks like how the "Toy Camera" mode looks.
Can't understand why you did this to a new camera. If you want a used camera, make it because you're traveling and shooting a lot, not because you think it is stylish. For me it is stupid to have a fake used camera.