In fact, the industry seems to go out of its way to prevent you from knowing what the sensor sizes actually are.
Other factors impact a sensor's resolution, including sensor size and lens quality.
Also unlike film, there is a limit to the sensor size of digital cameras.
Each of these noises has a different dependency on sensor size.
Lots of you said yes, the sensor size is far more important.
Much effort has been dedicated to reducing sensor size to sub-micrometre scales.
I don't believe they are increasing the sensor size, however.
At most basic level, though, sensor size is the key factor in determining how many photos can be captured.
You'd have to get an extremely large aperture to get that effect on something with the sensor size of a camera phone.
However, in terms of sensor size and price, the camera is more like a medium-format camera.