[Brightcolours]

Focussing on noise is a bit... besides the point, to be frank. A Nikon D70 is more noisy than a Nikon D500. Yet no one objects to using equivalent settings between those (iow: same FOV, same DOF... Same focal length, same f-value). Everyone will accept that one uses 35mm for a more or less "normal" FOV, and f1.8 for a more or less shallow DOF. No one will point out that that is a flawed concept, because of image will be noisier than the other because of different sensor generations.