Our friends at The Phoblographer have done a thorough rundown of many of the best portrait lenses available for the Sony mirrorless series.
Here's just one highlight, from the 24-70 F2.8 G Master -
"In all rights, this is a fantastic lens. It delivers wonderful image quality, performs well, has fast autofocus, and will make lots of professional photographers very happy. For the photographers that love zoom lenses, this is another reason to move to the Sony E mount system if you haven't already. It can tackle any sort of work that you can throw at it and combined with just the right Sony α7 camera body you'll get the results you really want." -ThePhoblographer.com