okay so correct me if i'm wrong, HDV is NOT HD basically it's not because it is being put onto a DV tape which cannot fit HD footage so it's compressed to a .mpg2 file instead of .avi like SD so when you burn it on a DVD it's being recoompressed to .mpg2 again, so basically double compression. the biggest difference between the two cameras is that the vx has a minimum illumination of 1 lux whereas the FX1 is 3 lux, they're both good cameras but the FX1 is pretty old, basically I would consider another camera, maybe the DVX100b or the Canon XHA1, a little more pricey but much better of cameras for the extra price.