Both Canon 7D MII and Samsung NX30 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 NX30 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 7D MII and Samsung NX30 Cameras
Canon 7D MII and Samsung NX30 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 7D MII and Samsung NX30 sensors have been tested by DxO and the results show that NX30 has a better overall score of 77, 7 points higher compared to 7D MII's score of 70.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 7D MII
70
22.4 bits
11.8 Evs
1082 ISO
Samsung NX30
77
23.5 bits
12.4 Evs
1014 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
Samsung NX30 ,
including hyperfocal distance.
