I'm pondering adding this prime to my kit and am wondering what folks think about it as a low-light lens. My kit right now is a 7D with the 400 5.6L and the 35L. I'm looking for something in the middle that'll allow me to do wildlife (etc) in low light, which the 400L just can't do. The 7D is just so noisy at/above ISO 800, so I'm looking for something relatively long and fast that's below 1k. The 70-200 4 will be too slow, I think, and the 2.8 of that lens would be out of my price range. (Plus I prefer primes.)
Anyone else using the lens like this?