Originally Posted by Electrix
Rebecca was hired because she looked good in the make-up. That's not a dig at Rebecca at all, it's just they decided to make her 'silent and deadly' which meant fewer lines. It worked, and her Mystique was great.
Lawrence was hired for her acting as Mystique actually had lines in First Class. Since that movie Lawrence has become more slimmer and toned because of The Hunger Games. She hasn't got a super model body but she doesn't need one. The focus will be on her line delivery.
Everything you said is true, except the body part. Do we really think that viewers are going to focus "on her line delivery"? The line that people will focus on is of the waist variety.