Both Canon 7D MII and Canon 70D have 20.0 MP resolution sensors but Canon 7D MII's sensor is APS-C (22.4 x 15 mm ) and Canon 70D's sensor is APS-C (22.5 x 15 mm ).
Since Canon 70D'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 7D MII.
Below you can see the 7D MII and 70D sensor size comparison.
Canon 7D MII and Canon 70D 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
Both Canon 7D MII and Canon 70D 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, 7D MII has scored 70, 2 points higher than 70D.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 7D MII |
70 |
22.4 bits |
11.8 Evs |
1082 ISO |
Canon 70D |
68 |
22.5 bits |
11.6 Evs |
926 ISO |