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I'm a bit confused.
Are you saying that, for example, a 5.4x5.4µm pixel on a FF sensor will receive more photons than the same sized pixel on an APS-C sized sensor?
Or is there some connection between physical sensor size and QE or read noise?
Of course a larger sensor receives more light than a smaller sensor but that light is divided amongst its pixels, or photosites.
EDIT: regarding that dpreview link, its hardly a surprise that the 7DmkII has better high I SO performance that the original - the original 7D had the worst noise of any Canon camera I've ever used!
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