I made a quick test with the 2 lenses on the Z9 to compare sharpness
I took also the a1 of my wife with the 100-400 GM
De 100-400 S scores better than the 80-400 and the 100-400 GM
From above downwards : Z9 100-400 , Z9 80-400 , a1 with 100-400GM


View attachment 759cb24f98ea467b9725479db5b72f46.jpg
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https://www.flickr.com/photos/159705946@N03/
https://500px.com/p/gunthergeeraerts?view=photos
I took also the a1 of my wife with the 100-400 GM
De 100-400 S scores better than the 80-400 and the 100-400 GM
From above downwards : Z9 100-400 , Z9 80-400 , a1 with 100-400GM


View attachment 759cb24f98ea467b9725479db5b72f46.jpg
--
https://www.flickr.com/photos/159705946@N03/
https://500px.com/p/gunthergeeraerts?view=photos
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