If only this topic was not limited to Canon, I'd now say maybe Fisheye-Nikkor 6mm f/2.8s. It has 220 degrees of coverage.
http://blog.graysofwestminster.co.uk/2012/05/01/amateur-photographer-nikon's-100k-fisheye-lens-whopper-finds-buyer/
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/fisheyes/6mmf28.htm
6mm f/2.8 Fisheye-Nikkor on a Nikon D800 - First Time Ever?
http://blog.graysofwestminster.co.uk/2012/05/01/amateur-photographer-nikon's-100k-fisheye-lens-whopper-finds-buyer/
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/fisheyes/6mmf28.htm
6mm f/2.8 Fisheye-Nikkor on a Nikon D800 - First Time Ever?
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