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Done a bit more homework. In Capen/Dobbin book "observing and photographing the Solar system" a bit dated now but still has some great info on all the planets...
They agree visually the resolution on planets is controlled by the contrast in the image and a resolution of 1/8 to 1/10 Dawes limit is achievable.
For photographic the resolution is not only the contrast but the seeing v's detector ie film grain size and sensitivity ( or today the CCD pixel size)
I think therefore for hi resolution planetary work we should assume the telescope system can give a resolution of 1/10 Dawes and then work backwards to the EFL to present this detail to the CCD pixels where at least two pixels cover the best resolution.
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