I just got the 60NX720 as a replacement for a 60" SXRD XBR1. I'm very impressed with this new set! Like many others, I had been concerned about how it would compare to my old SXRD - for me, it's been a very positive change. Just running with pretty much the default settings it has so much more contrast, brighter picture, realistic colors, very black blacks, motion seems perfect, all the net apps work as anticipated, there's a bit more reflection but not bothersome to us, and beautiful to look at on or off. I've also not observed any unusual artifacts such as flashligting. The stand feels a bit flimsy but actually works fine. Wifi works very well, but took a bit of experimenting to get MAC filtering operational due to dual MAC addresses. I've not tried 3D (this is a low priority for me).
I matched the Sony up with a Yamaha RX-V871 and a Panasonic DMP-BDT310. They all have HDMI 1.4 and their CEC communication between devices/remotes (once its set up) works great and is quite impressive on a feature like PIP/PAP where the audio is seamlessly swithed between the two TV windows from different input sources on the AVR.
Hopefully I'll get some time to try a few of the calibrations others in the forum have suggested. In the mean time, though, I'm quite happy with the 60NX720.