As a note, I have not yet been able to use to the XL2 but as to what was said at the workshop in LA, it hasn’t changed much except the 24p capabilities (correct me if I am wrong on the major changes)
The DVX is without a doubt a much easier camera to handle and use. For one, it isn’t back heavy like the XL series; it is an extremely well balanced camera. I like to think of it as akin to a sword, you don’t want to have your weapon to be unbalanced, it affects your craft.
The menu system is much more intuitive, I had to spend much more time learning (I even had to pull out the manual) the XL. The DVX on the other hand, seemed to be intuitive and just following logic got me to where I needed to be. Additionally, the mode wheel on the back of the DVX is a very nice way to give easy access to changing modes. The DVX just has a much shorter learning curve.
Even though you are able to get different lenses for the XL, I have been unable, save for the wide-angle lens, to try any of the others out. But the standard lens on the XL1 was absolutely horrible, and I much prefer the DVX's lens. It is easier to focus and seems to be smoother all around. But I am sure that there are much better lenses out there that are far beyond anything the DVX's Lens can be, they just cost more money.
Hope this helps answer your question.