[Klaus]

What would EXIF data be used for? FL and f-stop?

Personaly, I'd prefer slightly inaccurate data (let's call it "an indication") over just words in the text that are very subjective.

 

I also think that curvature information is sorely missing because the test procedure you are using masks it completely, if I understand correctly. In real life however, there is no practical difference between a lens that has blurry corners due to curved field and one that displays blurry corners for other reasons. So checking charts for corner sharpness of a lens is almost meaningless without knowing how strongly the image field is curved.  Again, I am talking from a practical, not scientific perspective, but still... One lens may have good test results, like the Canon 15-85, but in reality, it's corner sharpness may not be better than that of another lens which tested badly, such as the Canon 17-85.

 

It is not that simple I'm afraid.

If we would take the readings on the flat plane they would be very misleading simply because you won't really notice a mild field curvature but it would spoil the numbers. Thus there's a risk of overshooting in either direction. If it helps we could provide the 'flat view' results more often - I have no problems with this per se. However, I am very sure that there'll be more questions than without - also because the centering quality will play a much higher role in those charts.