I too still have an XBR960. I don't have the ZT60, but have a 65VT60. Both of which are not professionally calibrated but are using recommended settings.
The screen size upgrade of course is going to be big. Taking that away there are still some things I like better on the XBR960. One thing I think it is better for is watching live sports. For whatever reason I find the picture to be more fluid and natural on the XBR960.
Of course there are things you won't have to deal with anymore like geometry issues, and excessive over scan. My XBR960 has also developed slight discoloration on the upper right of the screen that I can't quite remedy with the landing settings.