Sony RX1R II has a
42.0MP Full frame (35.9 x 24 mm ) sized BSI-CMOS sensor and features BIONZ X processor. On the other hand, Sony A7R IV has a
61.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz X processor.
Sony A7R IV's sensor provides 19MP more than Sony RX1R II's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Another similarity between these two cameras is that both Sony A7R IV and Sony RX1R II sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the RX1R II and A7R IV sensor size comparison.
Sony RX1R II and Sony A7R IV 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. Sony RX1R II and Sony A7R IV sensors have been tested by DxO and the results show that A7R IV has a better overall score of 99, 2 points higher compared to RX1R II's score of 97.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony RX1R II |
97 |
25.8 bits |
13.9 Evs |
3204 ISO |
Sony A7R IV |
99 |
26.0 bits |
14.8 Evs |
3344 ISO |