Pros: Superior build quality, Fast auto-focus, images sharp enough inconspicous, excellent range for 40-50d
Fjor shooting face shots at weddings or other interiors, this is without peer. Fills the frame , works v. well with flash, iso at 1000-1500. Clients love output. Have had/traded several of these, sharpness varies, good to very good, sharpen in post-production. On the other hand, comparable to old canon 135 soft focus if lose focus. Have read other comments, have 70-200 f4 is, v. sharp lens but lacks reach and is conspicuous. Sim, have 100-400 is, great birding lens, but way to heavy and conspicuous for weddings and indoor photos, and it's not that sharp really, is it.