I've listened to the 890DC speakers a lot, mostly being driven by Rogue M150's. They are a fast, warmish speaker and I like them a lot. Actually, I've heard quite a few members of the Vento family, both current and one generation older, and I like their sound.
I do not have any experience with the Sonus Faber about which you also asked.
I do not have any experience with the Sonus Faber about which you also asked.