I agree with Pkancel, the Be tweeter is everything but shrill. It is incredibly airy, smooth and transparent, and probably one of the best in the world.
Yes Focals CAN sound shrill contrary to a lot of speakers which will impose their colorations on music and make everything sound more or less the same. But with proper matching (which is not difficult at all to achieve), they sound amazingly sweet and delicate. And if the music sound shrill (strings at full blast can do sometimes), then I want my speakers to be able to reproduce it.
I've noticed a lot of people are actually looking, consciously or unconsciously, for an interpretation of what live music sounds like, as opposed to the (sometimes uncomfortable, sometimes sublime) truth. And that's perfectly fine, it's all about enjoying the music after all.
But if neutrality and transparency (in other words, high fidelity) is what one is after, then the Utopia 3 series is the closest thing to live music I've heard. I have not heard everything out there but they are very, very special and fundamentaly different from what others do.
I won't comment on Wilson, which I haven't heard in a long time, except to say the beryllium tweeter is technically much more advanced than the titanium one.