Both Sony A7 II and Sony A99 have 24.0 MP resolution sensors but Sony A7 II's sensor is Full frame (35.8 x 23.9 mm ) and Sony A99's sensor is Full frame (35.8 x 23.8 mm ).
Since Sony A7 II'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 Sony A99.
Below you can see the A7 II and A99 sensor size comparison.
Sony A7 II and Sony A99 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 Sony A7 II and Sony A99 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, A7 II has scored 90, 1 points higher than A99.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7 II |
90 |
24.9 bits |
13.6 Evs |
2449 ISO |
Sony A99 |
89 |
25.0 bits |
14.0 Evs |
1555 ISO |