It is a truth universally acknowledged – all right, perhaps not universally, but many people I know happen to agree – that Colin Firth is the quintessential Mr. Darcy, the gold standard against which all other Darcys shall inevitably be judged. However much Mr. Firth may privately wish to leave Mr. Darcy, his sideburns, his horse, and his pond behind him once and for all and move beyond his most beloved role, the brilliance of his performance as Fitzwilliam…