I've heard the Sophia III on the same amp I use for my 7Bs, but different front-end and cables.
While the Sophia had the edge as far as tight, deep bass and a bit more clarity, I wouldn't say they had a $10k edge (about how much more they cost, used). In general I'd say the sound is somewhat similar, with the 7B being a bit more overall "musical" to my ear (and definitely better looking), and the Sophia having just "a bit more of everything". Not that I was ready to spend 10k+ on speakers when I bought. When I am, I'll look at more than the Sophia's, although I did definitely like them.
While the Sophia had the edge as far as tight, deep bass and a bit more clarity, I wouldn't say they had a $10k edge (about how much more they cost, used). In general I'd say the sound is somewhat similar, with the 7B being a bit more overall "musical" to my ear (and definitely better looking), and the Sophia having just "a bit more of everything". Not that I was ready to spend 10k+ on speakers when I bought. When I am, I'll look at more than the Sophia's, although I did definitely like them.