I noticed that on Linux Arial font is much clearer and sharper (for me more legible) than on Windows.
Google Chrome Version 35.0.1916.153 on openSUSE 13.1 x64 (post where text taken)
Google Chrome Version 35.0.1916.153 m on Microsoft Windows 7
Tried also with Mozilla Firefox 30.0, Opera and Safari.
I'm very curious how to achieve Arial font to be clear on Windows as is on Linux. Personally the only font I found legible on Windows web browser is Verdana. I tested Verdana using Chrome extension 'Font Changer with Google Web Fonts™'. I'm interested in other clear, sharp Windows web browsers fonts e.g. fonts that Windows renders properly, size increase/decrease doesn't make font fuzzy.