[adwf]

Perhaps. But speaking as a person from a physics background, a difference you can't quantify is a difference that may as well not exist...

I went back and checked the Medium website with a handful of different typefaces on the body text, and whilst I could tell a large difference in readability between the default (ff-tisa-web-pro?) and my systems DejaVu Sans, I honestly couldn't tell the difference the default and Georgia (serif) (screenshots in another comment below).

Which brings me back to my point, that the typeface is highly overrated in importance on a page. The choice of font-size, Sans/Serif, line-height/width, etc. all play a far more important role when it comes to readability.

I will admit that I do come from a strong science/programming background, so sometimes the more arty, design side of things escape me!