i believe it starts at 31.5 (DVX was 32-320mm) and goes to 409.5 then. it is somewhere in that range.
the Canon goes to nearly 1000mm in 35mm terms, so the DVX/HVX is still a rather short lens, but the wider end is definitely its advantage.
The HVX not only has a slightly shorter optical focal length than the DVX at its widest setting, but the HVX also has a native 16:9 imager, so your field of view is even wider (when compared with the same lens on a 4:3 imager).