[Klaus]

I can't recall the lat time I had a photo with a subject in the extreme corner.

 

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Most of the subjects in my photos usually closer to being on or within the orange circle.  The green circle is important for some images.  The blue circle is 99% useless...most of it is not even within the frame.  

 

PZ tests do not include data for the useful orange zone and give great importance to the blue zone.

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In the current version of the chart the "near center" point would be close to your orange zone.

 

However, again, we have different priorities.

I love my ultra-wides and in this case, the foreground is emphasized. And my attention is then usually drawn to the border zone.

I also enjoy "harmony" in my images - that is sharpness across the image field.

 

Honestly speaking - if just the orange zone is important to you, then 80% of the lenses should be fine really.