Any barrel distortion you may see in that snap, would be due to me not having the camera perfectly level. wink

But yeah, it's a phenomenally great lens. Very lightweight, too.

For full-frame (35mm sensor) cameras, Canon has the equivalent 16-35L lens (which I also have here). It is quite a bit heavier, though -- metal body, and (constant) f2.8 wide open.

Cheers