Canon 1D X has a
18.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Dual Digic 5+ processor. On the other hand, Canon 6D has a
20.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Digic 5+ processor.
Below you can see the 1D X and 6D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 1D X and Canon 6D Cameras
Canon 1D X and Canon 6D have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Canon 1D X has 11% larger pixel area compared to Canon 6D, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
DxOMark Sensor Scores
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 1D X
82
23.8 bits
11.8 Evs
2786 ISO
Canon 6D
82
23.8 bits
12.1 Evs
2340 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 1D X
or the
Canon 6D ,
including hyperfocal distance.