Both Canon 7D MII and Canon 70D have APS-C sized 20.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 7D MII and 70D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 7D MII and Canon 70D Cameras
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
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 7D MII
or the
Canon 70D ,
including hyperfocal distance.
