I gave the Avanti IIIs a short listen this week in New York (too short to be taken very seriously) and found they had a wonderful soundstage but lacked overall coherence and one might say saturation or weight. They are beautiful though. During the same session, I listened to the JM Lab Mezzo Utopias and was very taken with them, beautiful soundtage, wide and deep, very coherent, adequate bass and beautifully made. These were much more impressive than the Avanti III IMO. I also recently heard the Wilson Sophias which are marvelous (much more musical IMO than the Watt Puppies) and frankly are in a different class altogether than the Audio Physic Avanti IIIs.
I currently own the Talon Khorus and will upgrade to the X version. I have really enjoyed listening to the Mezzo Utopias and Sophias and would enjoy having either them in my home as satified as I am with the Khorus. The Avantis are definitely worth a more extended listen, however, for me, I doubt they'll make the final cut.