I am very happy with this lens. I considered the cheaper Sigma lens but ended up with Canon. Sigma should be very sharp. but that's all he has. On my Canon 5Dmk 3 I see no problem with the sharpness of this lens. The lens seems exceptionally sharp wide open, even at the edges. At an aperture of f/2.0 or f/2.8 it gets a bit sharper in the corners, but it's so sharp at the beginning that there really isn't much room for improvement. I have Canon 5L-class lenses and several other non-L Canon…

I ordered this lens about a month ago and it only left my main camera twice when needed. I do not regret the purchase. However, I'm sorry that I've waited so long to buy it (but who wasn't when I got my hands on this gem - and it's a gem of a lens). This is a fixed lens. The lens, it's sharp - but more than that - it's just incredibly sharp, the most beautiful bokeh, and it's built like a typical Canon L. Main downside - no weather protection - would be a nice addition. At f/1.4 there's some…