In my hands, the HVX zoom ring is as easy to use as the DVX zoom ring. The zoom ring on the HVX seems a tad "stiffer" but that's probably because I got my DVX with a lot of hours on it and my HVX virtually new.
The HVX ring is really "snappy". It takes a good tweak, but it makes it easier to control... you can snap to any point you want and not miss,with a little practice.