Canon 1Ds has a
11.0MP Full frame (35.8 x 23.8 mm ) sized CMOS sensor . On the other hand, Canon 1D X II has a
20.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Dual DIGIC 6+ processor.
Canon 1D X II's sensor provides 9MP more than Canon 1Ds's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the 1Ds and 1D X MII sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 1Ds and Canon 1D X II Cameras
Canon 1Ds and Canon 1D X II have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Canon 1Ds and Canon 1D X II sensors have been tested by DxO and the results show that 1D X MII has a better overall score of 88, 25 points higher compared to 1Ds's score of 63.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 1Ds
63
21.8 bits
11.0 Evs
954 ISO
Canon 1D X II
88
24.1 bits
13.5 Evs
3207 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon 1Ds
or the
Canon 1D X II ,
including hyperfocal distance.