Well, the adiZero "II," which isn't what it's actually called is a far cry from the originals, size and quality wise. The fit is a lot closer to true, unlike the originals, which is awesome. They also have no seams where the originals did, and that provides for a little better durability, which is a big win.
With increased TPU support in the upper, you can expect to get hurt a lot less too, which most people like. The front studs are shored up even more so they take more punishment on artificial turf. All in all, Adidas has done a great job with the upgrade on these boots, and the others from their Spring offering.