I have had the Nikon D3S for about two months. I have used the Nikon D3 for over three years and I really love it. I was also using the Nikon D700 as my second camera. The Nikon D700 is basically identical to the Nikon D3 in terms of picture quality and autofocus. They share the identical technology inside the two cameras. The Nikon D3S adds another stop and a half to the ISO as well as video capabilities and sensor dust removal (which the D700 had but the D3 did not). All three camera (Nikon D3, D3S, and D700) are 12.1 megapixels. For me the big thing was the reduced noise at higher ISOs. The two pictures were shot in a dark church and a dark reception hall in natural light. They were shot at 10,000 and 8,000 ISO. If you have a D3 you will be right at home with the D3S. The controls and handling are the same. The Nikon D3S is THE BEST camera on the market for photojournalists and wedding photographers or any photographer that needs to work in low light.