Canon has the 8-15 and Nikon doesn't.
...and the TS-E 17mm, and the MP-E 65mm. But...Nikon has a 200-400mm f/4 VR (a real, purchasable lens, not a 'we announced development of one but we haven't announced it for real and even if we do it'll be well over a year before you can buy one' lens).
What's the huge deal with the 200-400? It is a nice range to have ... and Canon has 400mm covered in 4-5 lenses at different price points does it not?