I am a new owner of the Legacy Focus, not the 20/20, but I know that the Focus play just about any type of music very well. better than any other speaker I have owned or auditioned. Bass is big tight and musical and mids highs and vocals are something special .My room is only 13'9" x 14'6" and they still sound remarkable, I do use some bass traps and other acoustical treatments and will be doing some fine tuning in the near future to see if these can be approved upon. Can't imagine improving them much more though.
As for the Silverline Sonata III, I have not heard these speakers, but heard of them and i understand they are pretty impressive as well, nice looking too.
Hope this helps a bit.
Mike