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In company with a good friend who I’d classify as one of the most skilled planetary observers in Oz we did just such a test.
Comparing two excellent refractors (.97 vs .94 ) it was extremely difficult to separate them visually but at silly magnifications (read 1200x) the higher strehl unit simply ran out of light rather than showing any image degradation (as was seen in the .94).
Even then you had to wait for fleeting moments of excellent seeing.
Where a higher strehl really comes into play is because it gives you more of a buffer from seeing perturbations when imaging. Systems that are barely diffraction limited instantly fall below that threshold with any seeing disturbances and often fail to deliver tight stellar profiles as a result.
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