Note: You are comparing sensors of very different generations. There is a gap of 7 years between Canon -1Ds Mark II (2004) and Canon -1D X (2011).Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.

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Straight out of camera, the RAW files on both cameras were more contrasty and vivid than my D700’s, closer in fact to how a jpeg would look. The Nikon D800 with its 36.3 megapixels and incredible dynamic range brings medium format quality to a DSLR body, and zooming in on files to inspect details is mind blowing.
The Nikon D780 scores a 77/100 in optics. It features a 25-megapixel full-frame CMOS sensor, Expeed 6 processor, and Nikon F lens mount. With a shooting speed of 12 frames per second, the camera captures high-quality images quickly. The DXOMARK score for the sensor is 97, which shows that it performs well in the market.
The Nikon D700 excels with its full-frame sensor, which provides better image quality and low light performance compared to the D300’s APS-C sensor. Additionally, the D700 has a higher DXOMARK score for the sensor at 80, while the D300 scores 67. This indicates that the D700’s sensor performs better in terms of dynamic range, color depth
1050shots. CIPA is an independent, standard measurement that determines how many shots a camera can take before the battery dies. has a removable battery. Canon EOS 1D X Mark II. Nikon D7000. The battery is removable and can be replaced by the user if broken. has a rechargeable battery. Canon EOS 1D X Mark II. . 325 17 452 421 227 307 130 367

canon 1ds mark ii vs nikon d700