Chelli, it's funny that I feel I should chime in, as a Canon shooter.
Do you shoot a Nikon now? Do you have a lot of glass?
I'm my limited opinion, if you do not have a d4, then yes, the S is a better camera. I don't know if they have the same sensors. If they do, then the colors should be about the same. In the Canon line, the flagship models DO creat a better colored RAW image, and that carries into the finished products. The pixel cells in the flagship cameras are of much higher quality than the lessor models. The pixels are spaced much farther apart, allowing for much less heat build-up and bleed from pixel to pixel. All of this plays into the RAW image produced by the camera. The much more expensive sensors are part of that bigger price tag.


In short, the S model is a better camera than the 4, but not to the extent of replacing the 4, if you already own it. Just my opinion, as it's your money.
If you do not own a Nikon, look at the video, "scott kelby, why I switched to Canon", as he talks a bit of colors produced. And if you are NOT a current Nikon shooter, the 1dx is also worth a lot of consideration.
Chelli, good luck in your quest for the D4s. ;-)
SS