O que achei mais inteligente por parte da Canon foi:
"With the 1D X, Canon's made a curious move. While its competitors continue the megapixel race, Canon has chosen to retreat from the 21-megapixel full-frame design in the 1Ds and 5D Mark II to an 18-megapixel full-frame sensor for the sake of greater speed, better high ISO performance, and presumably greater dynamic range." imaging-resource.com