I made this direct comparison several times as I was auditioning speakers. At two different dealers, the comparison was made in the same room with same front end.
The Sophia 2 was a little disappointing overall. It sounded like separate drivers with the tweeter calling attention to itself and the bass being about a 1/2 beat behind the rest of the music. Midrange a little veiled, at least in comparison to my ELSs that I was looking to replace.
The Sasha gave me everything I was looking for in my next speaker. It was very coherent with excellent integration of the drivers. Overall warmer and much bigger sounding with appropriate scale to the music. Both micro and macro dynamics were very good. In my search for speakers that could do what my previous Quads and Martin Logans did so well, but with the addition of real dynamics and body, the Sasha was the only speaker that fit those criteria. My auditioning also included Focal, Revel, Maggie, Arial, and Vandersteen.
I bought the Sashas and have been very happy. Note that I have not heard the new Sophia 3, which I understand is closer to the Sasha. You might add it to your list versus spending the extra $$ on the Sasha.
You can also go to the Wilson Audio forum on Audio Aficionado where there is much written about the two speakers.