I saw this in Jessops today, I was fully aware of it when I was looking at the Sigma 70-200mm F/2.8 EX DG HSM Macro but I sure as hell didn't know about this L lens! I am now torn between these two lenses. On one hand the Canon lens is cheaper and lighter. It's got great image quality. An aperture of F/4 throughout. Very little lens distortion. But the Sigma has an aperture of F/2.8. Cheap for a F/2.8 telephoto. The lens collar included. They both have great reviews but I'm now looking to get the Canon lens as I can afford it sooner and it's still got great IQ. I could probably afford it by April or May of next year, possibly sooner. If I go for the Sigma, I would have to wait about two months more. I'm desperate for another lens as I've only got a 50mm F/1.8 (a great lens, but I'm getting bored with the same focal length all the time) I want to get into wildlife photography and when I'm holiday I want to have a lens where I can take shots without people knowing about it. (I'm not a pervert but I asked people if I could take there photo and they don't look natural) Can you help me decide what to go for?