What lens and aperture were you using? As far as I'm aware, you would only expect to see a difference with very wide aperatures. As you mention 500 mm, I suppose you aren't using anything near f/1.2 or 1.4* I can *not* get EFCS to show any deterioration in large bokeh balls at any exposure speed (all the way up to 1/8000"). I expected to see just the tops of the bokeh ball, but I can't find any change. I don't know if this effect happens at normal focal distances as I didn't test it.
To check out what effect you would be looking for when combining a wide aperture, fast shutter speed and EFCS, check out this thread: https://www.canonrumors.com/forum/threads/rp-is-a-bokeh-killer.38216/
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