Sony A7 IV has a
33.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor. On the other hand, Sony RX1 has a
24.0MP Full frame (35.8 x 23.8 mm ) sized CMOS sensor .
Sony A7 IV's sensor provides 9MP more than Sony RX1'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 difference between these two cameras is that Sony A7 IV's sensor lacks anti-alias (Low-Pass) filter. 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 A7 IV and RX1 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A7 IV and Sony RX1 Cameras
Sony A7 IV and Sony RX1 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. On the other hand, since Sony RX1 has 37% larger pixel area (35.50µm 2 vs 25.88µm 2 ) compared to Sony A7 IV, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
DxOMark Sensor Scores
Both Sony A7 IV and Sony RX1 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 IV has scored 97, 4 points higher than RX1.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A7 IV
97
25.4 bits
14.7 Evs
3379 ISO
Sony RX1
93
25.1 bits
14.3 Evs
2534 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
Sony A7 IV
or the
Sony RX1 ,
including hyperfocal distance.
