It is an L and easily the most bang for the Wildlife buck. I just don't shoot any primes,whether they L or otherwise.

Honestly,I think it prefers my XTi body to my 40D and it really cooks on my 1Ds,though it's hard to holster the inherent 1.6x crop factor for critters and the like. All give and take,like everything else. I need to slam it on a 50D and see if I can micro-adjust it to REALLY sing. Same goes the 5D MK II body,as a control curiousity.

I think Humper's 100-400mm L may be better than mine too,as he guns some absolute zingers with regularity.

I fight OOF more than I like,though everything is straight out of the camera less any post production,as I haven't the time to massage all the frames.