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Canon EF 8-15mm f/4L Fisheye USM review @ Tech-Radar

"As an L-series (Luxury) lens, the EF 8-15mm boasts fully professional, robust build quality. Features include a constant f/4 maximum aperture that's available throughout the zoom range, environmental seals to guard against moisture and dust and fluorine coatings on the front and rear elements to enable easy cleaning. 

That's a bonus, because the protruding, dome-shaped front element is very exposed to the weather. Plus, the supplied lens hood can only be used at 15mm, otherwise it cuts into the corners of the image.
 
Ring-type USM (Ultrasonic motor) autofocus is super-fast and practically silent, complete with full-time manual override. Measuring 78.5x83mm and weighing 540g, it's rather larger and heavier than Canon's now obsolete EF 15mm f/2.8 fisheye prime lens, but still smaller and lighter than the regular EF 16-35mm f/2.8L ultra-wide full-frame lens.
 
In our tests, sharpness proved very impressive, especially between f/5.6 and f/11. The lens is also remarkably resistant to ghosting and flare, helped by the use of Canon's Subwavelength structure coating (SWC). That's good news, because you often capture a vast expanse of bright sky when using a fisheye lens outdoors. 
 
As with other circular fisheye lenses, we often got a blue edge around the circumference of the image in circular fisheye mode, but it's quite easy to apply a circular crop in Photoshop to fix this. Colour fringing around high-contrast edges was also quite noticeable, but you can shoot in RAW and tune these out in the Digital Photo Professional software supplied with your Canon camera."