I just bought this lens and was comparing it to my 28-70, 70-200 and 300f4. I noticed that the 28-300 shot wider than the other lenses for a given focal length. This occured at 28, 200, and 300, being most noticeable at 200 and 300. A 1DmkIII was used for the testing.
Has anyone else noticed this? Is this normal?

