I've used 005 sans pre, and with Pass XP-22 and modded Coincident Statement pre's, somewhat threadbare with no pre. 005 easily exposed differences between the Pass and Coincident, and easily exposes differences with virtually every change I make in system. Newer Sabre chips have typical high resolving/transparency of Sabre chip dacs with more natural presentation, need to research differences between the 9038pro in 005 vs. 9039pro in 006.
I'd also expect continued change, albeit more subtle post 400 hours, Dueland caps, silver wire improve with more time.