2 things made this a "Must Buy" for me, even though I already had V 1:
1) The Mauser pistol w/2 extra gloved hands to pose with. The original had 2 gloved fists, and 2 extra open, flesh-colored hands. Its nice having a gloved right hand to hold the pistol and an open gloved left hand as well.
2) The head is much more poseable; you can actually tilt it back to have him looking straight up or for "flying" poses, or tilt it forward and have him looking down as well. You couldn't achieve that with the original.
The taller body is nice as well, allowing him to fit in better with other 1/6 figures. And having the hair painted on the back of the neck is a nice touch. Really, the only thing that could improve V 2.0 significantly would have been if they had included an extra Cliff Secord head that you could swap out with the helmeted head, and maybe also an empty helmet that he could hold. Since I doubt a removeable helmet version would have been achievable, the Secord head would have been nice.
I'll probably keep both, but if I had to choose one, the 2.0 version would be it.