hey folks, If you haven't noticed, there's a big typographical change from Helvetica Neue to San Francisco on os x (iOS as well). It's a special variant of San Francisco, different from the watchOS version. I was intrigued so I ported the font back to Yosemite using the system font patcher. I'm sharing those fonts for those who are curious to try (but don't wanna install 10.11 beta on their production system). All you need to do is extract the fonts into /Library/Fonts/ and reboot. To remove simply delete the fonts. Somethings to note, the metric looks distinctive from Helvetica Neue, so far I like it.