Z CAM E2-S6 II 6K has a
26.1MP Super 35 (23.5 x 15.7 mm ) sized CMOS sensor . On the other hand, Blackmagic 6K Pro has a
21.0MP Super 35 (23.1 x 13 mm ) sized CMOS sensor .
Z CAM E2-S6 II 6K's sensor provides 5.1MP more than Blackmagic 6K Pro'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.
Below you can see the E2-S6 Mark II 6K and Cinema Camera 6K Pro sensor size comparison.
Sensor Size and Resolution Comparison image of Z CAM E2-S6 II 6K and Blackmagic 6K Pro Cameras
As seen above, Z CAM E2-S6 II 6K has a 1.2x Larger sensor area than Blackmagic 6K Pro. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
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
Z CAM E2-S6 II 6K
or the
Blackmagic 6K Pro ,
including hyperfocal distance.