[Brightcolours]

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.

In real life there is a big difference: if corners are blurry, they are blurry. Like the extreme corners of my(the) EF 35mm f2. If there is some field curvature, chances are there is something sharp in corners, because a scene usually is deep (3D).

Can you give examples where the field curvature from that lens gives you problems? Which focal length?

When I look at image samples taken with that lens, I only notice the CA in the corners, CA which is easily corrected.

https://pixelpeeper.com/lenses/?lens=13192