If content is King, then the presentation of that content must be the Queen.
Franz Josef uses FontAwesome, a vector-based set of icons. This means that the edges and curves of all the icons that the theme uses will actually become sharper the higher your screen resolution goes. Not only that, you also get more than 500 ready-made icons that can be used in your content straight out of the box.
On top of that, clear and effective typography ensures that your content maintains its high readability, no matter on what device it is being displayed on, or the character sets that you use.