I think there'd be a smaller amount of hand to hand, especially once she gets her powers. No need for a long drawn out fist fight when she could throw a stellar blast their way. And as for use of doubles, look at the BTS AOU and all the use of them Scarjo has. I'm sure there's a bit of digital masking going on there with her too, so it's not that big of a consideration. And the use of wire work for flight SFX while still used is no where what it was. If you look at the MOS behind the scenes, lots of Cavill was done laying down in studio, though there was also some wire usage, true. Let me put it this way... Theron or an actress in that ballpark is still better than the actors on the darkside of their 50's or early sixties that keep getting brought up for Deathstroke. She's in pretty good physical condition.