I haven't heard either but I do know Wilson pretty well, and while I'm sure the X are very very good I find it hard to believe they are $29K good. I thought the original Sabrina was... not my cup of tea.
I believe they are $18k. Next step up is the Sasha DAW at like $36k. The Yvette was around $26k but I think they are going or have gone bye bye. The SabrinaX does not sound like the Sabrina. I would pay $18k for the X's before I would pay $10k for a used Sabrina. They are that much better sounding to me.