I can say precisely which lens was used to make that photo: Canon EF 17-40 L USM on a DSLR. Or some other very, very similar lens. No photographer can mistake this for anything. Like this: http://www.flickr.com/photos/meonoctis/5661946485/in/set-721...
For true pros, the 16-35L would be more common than the 17-40L, since it is an f/2.8 instead of f/4.0 lens. It's almost a given that anyone shooting Canon owns the 24-105L, so when opting for a wider angle lens the 17-40 and 16-35 are your two most common choices. The 16-35 gives you the wide-angle, PLUS lower f/stop (The 24-105L is f/4.0 also)
I don't think you can tell with any degree of certainly which specific lens was used for these shots.