Yeah, the durability you get with higher priced gear is pretty nice. 5 years and counting with my HD650s. Most of the stuff in the market is grossly overpriced when it comes to the used components though. We need more people like NwAvGuy, not companies asking 10x profit like Schiit.
It is entirely possible that some people hear the difference between a flac and a 320bit mp3 as mp3 is lossy and somewhat based on the physiology of the human hearing. It could totally differ depending on the individual, personally I don't care that much. Spotify through Fidelify (and ASIO) is fine enough
I prefer these over the Huanos in my FK, can't say anything about the ZA11. In my opinion they feel kinda like the vanilla Rival clicks.