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Bert,
Interesting to do a numerical comparison on the upsized and standard resolution versions (although somewhat risky - it looks like there was some difference in processing, e.g. there is a noticeable variation in colouring).
The difference in SNR is about what theory would predict at 2.21 (1.5^2 = 2.25). The eccentricity of the stars is effectively the same (0.5428 vs 0.5427). FWHM is 4.796 pixels for the upsized version which scales down to 3.1973 pixels vs 3.745 for the standard resolution image.
Cheers,
Rick.
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