Having seen Vivien Leigh, Greta Garbo, and Keira Knightley as Anna Karenina, Claire Bloom's Anna is much less convincing, rather more affected, and Sean Connery as her lover is miscast. This sixties, stagey interpretation of the story is not well done. The sets are clumsy, the design contrived and looks as though the whole thing was done on the cheap (which it might well have been!). So a very disappointing production. Having said that, I wasn't too happy with Keira Knightley's film - but for different reasons. The best film version has to be Greta Garbo's, but Vivien Leigh is a only a short length behind.
Claire Bloom is too moody, too self-conscious, too modern, for Anna. The part needs a naivete which Claire Bloom doesn't have. Vivien Leigh captures this with her combination of sophistication and innocent charm (as she did as Scarlett in Gone With The Wind).
So if you're looking for a good film interpretation of this wonderful, amazing book, don't choose this Claire Bloom and Sean Connery version.