My wife is considering getting a small camera such as the NEX-7, Oly Em5, Lumix GH3, or Sony SLTA57 or A65. Any of them meet her need for a lightweight system with decent picture quality. However, she does a lot of shooting in situations such as powwows, where she might close in on one dancer and shoot a burst using continuous focus, panning with the dancer.
She is currently using a Sony A100, and gets a pretty reasonable rate of in-focus pictures, but wants to upgrade this aging camera. Going to a SonySLT would enable her to use her current set of lenses, which is highly desirable.
What is your experience with the above cameras in the kind of shooting she does? She does not want to go to a full frame camera because of size and the fact that she would have to buy new glass, even with a Sony.