I think the V1 is lighter. The EX 1 seems a tad more rugged in build even though in dimension it is not a lot bigger ( It is taller)
In short the EX1 is a little less portable but its video is "to die for" as they say
The V1 is however by no means a poor relation
The differences boil down to the fact that HDV is considered a "step " below XDCAM in Hi def stakes and machines using the XDCAM are placed a step "above"
So they are really not directly comparable as the EX1 is aimed squarely at the Pro Market . Its Fujunon Lens is apparently better( a matter of degree )
Can I suggest you look at the Sony Z7? which features interchangable lenses and also records to Compact flash cards as well as HDV tape?
I think it can compare with the EX1 ( format aside)
PS:Just seen Chris suggested it as well