Both Samsung GX-20 and Pentax K20D have APS-C sized 15.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the GX-20 and K20D sensor size comparison.
Samsung GX-20 and Pentax K20D 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 Samsung GX-20 and Pentax K20D 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, GX-20 has scored 68, 3 points higher than K20D.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Samsung GX-20 |
68 |
23.1 bits |
11.2 Evs |
714 ISO |
Pentax K20D |
65 |
22.9 bits |
11.1 Evs |
639 ISO |