After some investigation and reading Comments on Debian-Bug-Report http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=385798 it seems like openoffice simply is always using freetype-autohinter instead of respecting fontconfig-settings.
Turning on autohinter in ~/.fonts.conf causes, that GNOME-Apps and OOo are looking the same when using new freetype (but worse as if bytecode- interpreter is enabled). So it seems like old freetype-lib in combination with openoffice uses bytecode-interpreter, new freetype not (why, I don't know). -- [Edgy] font hinting does not work with libfreetype6 v. 2.2.1 https://launchpad.net/bugs/54776 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs