Shot an Ironman today and the 5dm3 didn't fail me. Used setting 2 on IS on the 70-200 shot bikes case 3 4 pt af, excellent focus and re-focus speed, shooting bikes where they are in groups is the most demanding of skills shooting these events. Keep thinking of selling 1dm3 and 5d and buying a second 5dm3. Shot 16000 iso at 6:15 am as people gathered to the start area, just amazing. I shot this for another company so i don't have samples, sorry.