Compare Branagh's inflections with Denisof's, basically. Branagh was unselfconscious about what he was doing, and hugely influential, so naturally, Denisof - apparently given no alternative cues - finds himself using similar vocal and emotional patterns. Now and then, he appears to realize it, and try to be different, but he is self conscious about it, and it's obvious and awkward, and he has nothing better to do instead. See especially the gulling scene, complaints about Claudio as a lover and "serve god, love me, and mend."

Unless my memory fails me, which it mght, in which case, just watch Branagh and the buy another movie ticket.