Light gathering in M43 vs FF

Macx wrote:

In such a setup, the 135 FF format sensor will have approximately four times as many photons hitting it compared to the four-thirds sized sensor.

But as others have pointed out, the cameras aren't set up to take the same picture. For the same DoF the aperture on the FF needs to be two stops smaller than the aperture on the M43 and all other things being equal, that cancels out the FF photonic advantage.