Visit this thread
. At the bottom of the page, you'll find three photos taken on a 1Ds with the 16-35 f/2.8, 14 f/2.8 and 15 f/2.8 fisheye.
No, you won't, the images have been taken off the web.
But here's an image taken of yours truly
with the 15mm f/2.8 on the 5D that should illustrate how that one works quite well. The right side is cropped, but it doesn't matter here.
I'll post an edit if I find an image I can use that was taken at 16mm with the 16-35mm f/2.8.