Both Canon 1D X II and Canon 6D have 20.0 MP resolution sensors but Canon 1D X II's sensor is Full frame (36 x 24 mm ) and Canon 6D's sensor is Full frame (36 x 24 mm ).
Since Canon 6D's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Canon 1D X II.
Below you can see the 1D X MII and 6D sensor size comparison.
Canon 1D X II 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.
DxOMark Sensor Scores
Both Canon 1D X II and Canon 6D sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, 1D X MII has scored 88, 6 points higher than 6D.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 1D X II |
88 |
24.1 bits |
13.5 Evs |
3207 ISO |
Canon 6D |
82 |
23.8 bits |
12.1 Evs |
2340 ISO |