In article , Neil
wrote:

https://www.dpreview.com/files/p/art...eSense-Sensor-
Size-Comparison-x800.jpeg

size matters. full frame sensors have about a stop less noise than crop
sensors, which have about a stop less noise than micro 4/3rds, which
have a lot less noise than compact cameras and certainly cellphone
cameras, which have tiny sensors and very aggressive noise reduction
(which works fairly well, but not without compromise).

So a bigger sensor means less noise for the same sensor type.

Nospam ignores the fact that his reply to my comment was comparing
_cameras_, not the noise level of a single sensor cell.

i was comparing cameras.

At 12mp, the
final output of that 8x10 camera will not produce an image with the same
linearity and gradation accuracy of a camera with a much smaller sensor
but two times as many pixels. So, the inevitable errors in the final
image is also "noise", and more relevant than what the individual sensor
cell can capture because it's the image that one looks at, not the
sensor cell's noise level.

false.