I just updated my A2 from 1.6 to 2.0. I did not do an "initialize" after updating (not sure if you have to or not).
Boot time and disc loading time does not seem to be any better.
Tried HDMI->DVI again. With 1.6, I had black crush to my Sony KF50-WE610.
I still have black crush. King Kong is WAY too dark. DVE pluge pattern doesn't even display the blacker than black bars. I cranked my brightness up 20 "notches" and couldn't see anything.
Everything still looks good through Component, which is what I've been using and what I'll continue to use, I guess.
Not sure what this update adds in terms of major functionality. I would think it must be something significant to warrant the 2.0 number.