Sorry, perhaps I should have been a little more specific. MX Nats and AORC events are off road motorcycle competitions so a lot of high speed action. As for portraits I currently use a 70-200mm f2.8L II IS (this is an absolutely awesome lens for getting in close but not freaking out the subject) or a 50mm f1.4 but.....I'm after a few different styles of portrait, focussed on the face/eyes but having that part the farthest from the lens. Perhaps having a high heel shoe or wedding ring on a perfectly manicure hand close to the lens. I've seen a few shots like this particularly using HSS. I guess really I'm going to use this lens mostly on motorsport so if it's going to be too wide for that I should look at the 24-70mm.