Queen Mary vs. Queen Elizabeth in 'Mary, Queen of Scots'

Looks like this has been the week for period costume drama trailers, hasn't it? Saoirse Ronan and Margot Robbie face off in this historical drama, which I honestly don't think looks very good. Neither actress looks like she's up to the challenge of this kind of character (especially Robbie, who resembles the Red Queen from Alice in Wonderland in parts of this trailer). But I guess we'll see when it comes out in December.