Actually, legibility is relative. For example, when polled many Europeans cited sans-serif as easier to read. English and North Americans preferred serif fonts.
Also, there is data that elderly, autistic, and dyslexic people can more easily identify sans-serif fonts. Many people with limited eyesight have also reported sans-serif as better for them. (Ever notice an eye chart is sans-serif? 
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Font options for PDFs clipped by sorter?
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