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As the Dawes limit applies to seeing a single point source as just being percieved as two , that you are going to need greater sampling than just half pixel size to acheive diffraction limited imaging - I'm guessing at least 1/3 pixel scale maybe even less .
I know that planetary imagers typically use F# of f20 to F50 so Airy Disc size is 30 to 80 micron to the first minima. Combined with the fact that those imaging cameras usually have pretty small pixels I'm guessing that there is significant oversampling of the Airy Disc going on to extract all possible planetary detail
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