Canon EOS C70 has a Super 35 sensor with dimensions of 26.2 x 13.8 mm and sensor area of 361.00mm2.
It is 39% smaller than the average Mirrorless sensor in its class. In cases where all the other parameters are the same between two cameras, the one with the larger sensor collects more light per pixel and performs better (less noise) in low light / High ISO conditions). Larger sensors also give the photographer more control on the depth of field.
Read our detailed Canon EOS C70 Review