I think W2 is much more powerful than the WM1A.Thanks guys! It certainly requires some patience, but enjoyable to see the changes - interesting on the Sony note of requiring 200 hours, it sounds like a long time, but over the context of the expected product lifetime, not really that much!
W2 is more analytical, a bit cleaner. Bear in mind, my experience is with a brand new WM1A. It of course lacks the power relative to the WM1A, but does a darn fine job of driving my Z1Rs. It does a lot for the money - a perfect solution for my current streaming needs. I do see a streaming DAP in my future, however none on the market currently tickle my fancy due to issues one way or another.
@Scuba Devils has the MEST Mk2 and a W2, so he can probably give you an overview or how they match
I like the Project Z firmware because it seems to me the perfect solution between resolution and warmth, at least with the IEMs that I currently have. It is much warmer than the official firmware.