I am trying to use the same font in Kubuntu 14.04 both for native KDE apps and for GTK apps.
If I use the GTK entry on System Preferences to set up the font, I see the following problems:
1: Only some applications actually change the font: For example, it works on Pidgin, but not on FIrefox or Evolution. THis problem with Evolution is my major concern, because the default font is too big
2: THe font size works in a strange way. All fonts look bigger than on KDE Applications and it seems that there is a bottom limit, so I cannot set small sizes