There are some language specific letters that look different from normal Latin letters. It's very annoying and looks ugly.
Of course, you can choose Force Unicode Font: ON, but then the font lose its magic and doesn't look like Minecraft font should look. Russian and some other languages letters look bad even with Force Unicode Font: OFF.
Also I tried to fix those letters with a resource pack, but it still looks a little bit different (it lacks some sort of shadow).