Genevieve Bujold was perfect casting for Anne Boleyn, don't you think? Nobody else before or since has quite measured up in this role. Dorothy Tutin was very moving in the BBC's The Six Wives of Henry VIII but too old for the part; Natalie Dormer in Showtime's The Tudors was the right age and very sexy (and like Boleyn, and like Bujold and Tutin, definitely brunette) but lacked the refinement and elegance of the historical Queen Anne. Bujold somehow managed to combine all these traits, as well as the important quality of vulnerability.
I couldn't stand Richard Burton as Henry VIII, however. That beautiful voice... but he looked nothing like Henry VIII (any more than Jonathan Rhys Meyers looks like Henry Tudor!). The only adequate Henry VIII has been Keith Michell in the BBC's 1970s series Six Wives. As Michell portrayed him, the young Henry was sexy (as I'm sure the young HVIII was in spades) as well as vaguely sociopathic. He was not, in other words, completely sympathetic all or even most of the time. Whereas every other production has wound up making Henry look somehow misunderstood by everybody, especially his "bad" "inadequate" wives, who, with the sole exception of Jane Seymour, "failed" to give him a living, breathing male heir. Such is the power of the stereotype of the "powerful male ruler" and the "good royal wife."
