The EOS 1D Mark III has a better sensor type than most similar spec cameras that have been on the market for more than two years. This Canon camera has a CCD sensor type, whereas most cameras that were released more than two years ago have a MOS sensor type. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
A CCD sensor type is actually the best sensor type amongst all digital cameras of a comparable age and type to the EOS 1D Mark III.
A MOS sensor type is the worst sensor type across similar types of camera.