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by semi-extrinsic 3405 days ago
I have a superzoom myself, and I'm not surprised at this. I guess you saw not just the difference in optical resolution, but particularly in hazy conditions, that the much larger front aperture on your 800mm prime means is "averaging out" blur from haze and air motion to a much greater extent, giving in total a much higher clarity.

In the middle of a hot summer day, the 800mm end on my superzoom is near-useless, but at or after sunset it's much better. Still very noticeable difference from your 800mm prime, I guess, but less so than at midday.