To each their own, tastes in speakers are fairly subjective. They sound great to me in my listening space with my equipment, which is a 19 foot by 33 foot room (rectangular). I could use a better source, but even with this one, I'm satisfied till I save up for something good.
If you are looking for coloration of your jazz music, you likely won't get that from a B&W speaker, perhaps try some of the Boston Acoustic speakers along with those Sonus Fabers. I don't like a speaker adding too much of its own character to recordings, but that is just me, and that is why I like the B&Ws so much, also it is the same reason I am using the Brystons. Especially because I like to listen to a lot of live performances, like the Dead, Yes, Allman Brothers, Three Gs, as well as live Jazz and classical (I have pretty much all of the "Living Stereo" recordings). I value my speakers for their neutrality, so I can get as close as possible to the real sound as on the day I went to some of the concerts I listen to (Dead shows especially).