Yup. Font settings altered via systemsettings app don't seem to apply. For those who have gnome installed this might provide a workaround:
cd .kde/Autostart ln -s /usr/bin/gnome-settings-daemon -- Ugly fonts in gtk apps under edgy KDE (kubuntu) https://launchpad.net/bugs/65820 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
