Helvetica Neue is not optimal either, especially due to the light weight used in iOS 7-8, but it I find it still acceptable. For my taste San Francisco looks a

Helvetica Neue is not optimal either, especially due to the light weight used in iOS 7-8, but it I find it still acceptable. For my taste San Francisco looks a bit too blocky due to the flattened curves along the vertical axis. It's not bad, but I like Google's Roboto typeface, for example, better.