I picked up a 55-250 lens yesterday. WOW what a difference over the 18-55.

Do you guys have a recommendation for a wide angle lens? I am on a project right now where we have 4 racks and i cant get a head on shot because they are in a hallway. I got pretty close with the 18-55 but not quite right.

I saw this one Canon EF 17-40 mm f/4L USM Ultra-Wide Zoom Lens. Is there something better?

Thanks