The size of megapixels is not a major factor when buying a camera, including if it is to produce images with good quality.
The quality of good photographs obtained from several factors, such as sensor size and sensor resolution which owned a camera, including image based by the processing.
How to select Canon EOS-1DX's camera
For full frame camera that's in the latest Canon EOS-1D X, Canon megapixel magnitude's lower than the previous model. In full frame camera model EOS-1Ds Mark III, it was equipped with a 21 MP CMOS sensor and Digic III, was in the EOS-1D X it provided 18 MP.
The decline was accompanied by a 'weapon' processor dual Digic 5 + so there is little noise at high ISO. With these changes, then the resulting image quality, very good claim.
"The size of pixels and a larger sensor further enhance the light collection efficiency so that the results obtained photographs become more perfect," according to the principles held by canon. With this, the noise that occur in photos taken with high ISO usage will be minimized.