I think the 1D Mark IV handles noise much better than the 5 D MKII does, James. I don't mind a certain amount of noise and for agility folks are very happy to get a decent action shot with only slight grain to it. Alot of agility photographers will only offer 5x7's as their largest size for indoor trials and although sometimes an image here or there will have more grain than I desire and I will tell the client that it would be best if you ordered that particular one in a 5x7 due to lighting conditions, I am finding with the Mark IV that I am able to offer a great amount in 8x10 and still have it look acceptable.