The Canon EOS-1D X looks awesome, and has something I’ve wanted/predicted for a long time: less resolution (18 megapixels versus the 1Ds Mk III’s 21.)
There’s a couple of things that we consider when we think about [image quality]: number one on this sensor is noise. It’s clear the noise level is better than in the 1D Mk IV or the 1DS III. The pixel size is larger than in the 1DS III or 5D Mark II (6.95 microns, versus 6.4) and the difference is even more striking compared to the 5.7 micron pixels in the 1D Mark IV. That helps us in terms of light capturing ability and increases the signal to noise ratio. In turn, that does nothing but help the dynamic range of the camera.
The bigger the pixel, the more surface area it has to soak up light, which literally makes everything better. I’m glad Canon has bowed out of the megapixel race and shifted their marketing towards individual pixel size.
Other cool features: gigabit ethernet port, dual card slots, intraframe (editor-friendly) video compression, standard ISO up to 51,200 (!)