Well, the Salon2 doesn't blow away the Thiel 7.2. The Thiel is a classic and a bargain. However, newer drivers and technolgoy do make a difference.
I think the Salon2 has less cabinet resonance and the beryllium tweeter is silker and smoother than the Thiel's tweeter. Bass is very close between them. Salon2 can play a bit louder with less compression. The 7.2 has a bit more punch on the upper bass. Don't know if this is due to Thiel's cabinet resonance. Soundstage and imaging are very close among the two. The biggest difference is the Salon2 has a bit better transparency.