The Nikon D3S and the EOS-1D MKIV were put to the test by two pros. Ever since hearing about their release, I've wanted to know "Who's going to win the high-ISO battle?" The following is an excerpt:
"What's clear from the test is that the Nikon D3s has the best high ISO performance of any camera on the market, hands down. It bests the Canon EOS 1D Mark IV by at least 1 stop, and even beats the Nikon D700, which has the same sensor and ISO performance of the original Nikon D3."