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SwissFrank said:

[...]
Also the people who are bragging about how most people don't know how to even spot this (which implies that they have this secret knowledge) is doubly irritating: if you know something so important, why not share it with the group? [...]

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Roger from lensrentals has a piece on dpreview on testing lenses yourself, including graphs, plots, sample pictures and more.

koenkooi said:

Roger from lensrentals has a piece on dpreview on testing lenses yourself, including graphs, plots, sample pictures and more.

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Interesting! I will check it out!

OK, nice enough article, but I kind of knew this stuff. Funny he also shoots grass, I do too for the exact same reason. Now it doesn't matter but in the days of film, where only the center sensor worked great, you HAD to know field curvature to do focus-recompose-shoot.