I've auditioned WA's Maxx (over 100k/pair) with Krell separates and I can't say that I was floored. On the other hand, Salk's Soundscape 8 which I heard I was massively impressed. I'd even say that these are the best speakers I've ever heard at any price point.
I am not saying that Sophia's are good or bad - I have no idea. All I am saying that in order to improve the sound, it would be speakers, not electronics, which will be the biggest impact. Again, not saying that all amps sound the same, but the difference between Krell/Naim amp and Denon/Yamaha, both work within their limits isn't nearly as massive as between two speakers.
btw: found their measurement here: