On the Zu vs Coincident questions... I own a pair of Zu Essences. I have not heard the Coincidents, but my guess is that the Coincidents will throw a deeper soundstage, front to back, while the Zu's will be a bit quicker on the attack. I am guessing that the coincidents, with their narrow baffle MTM, have great midrange dispersion. The Zu's have a wide soundstage but it is not remarkably deep. I can't vouch for tonal differences, but I can say that the Zu's are stunningly sweet and detailed with the right equipment.
Anyone listen to Zu Audio's Definition Mk3?
Comparisons with the 1.5s and the others that came before? Getting the itch; again......