Depends whether you want the full circular 180° image or the corner to corner version. If it's the full circular one, I find the Sigma 8mm does the job very well on my FF bodies.
This is a shot from it on FF. (Cropped to square to remove the extra vignette areas)
ExCollFish by gpn63, on Flickr
and this is it on a crop body (Nikon DX rather than Canon but the effect will be similar on Canon crops.)
Seaattopcliffatbottom by gpn63, on Flickr
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