I'm interested in the answers to John T's questions for Linux as well, as there have been reports that font rendering there could use some improvement (though I don't have a Linux machine to test it and the reports don't back themselves up with screen shots or quantifiable data).
http://stackoverflow.com/questions/18382969/can-the-rendering-of-the-javafx-2-8-font-be-improved (sorry to add another John to the thread to confuse it ;-) Regards, John Smith
