This lens is amazing! I used to own a 15mm Canon Fisheye, but after switching to digital few years ago I wasn't really getting the most use of it due to the crop sensor (Canon 20D and Canon 7D). I decided to sell it and get this Sigma 8mm. I have to say the creative views of the Sigma lens is so impressive. I love the distortion, clarity and speed of this lens. It is also compatible to a Full Frame Sensor, so if i ever buy the 5D Body, it can give me a full circular view for even more creative ideas.
Bottom Line Yes, I would recommend this to a friend