I held the gen and my V2 in my hands, and:
-V3 caseback is more accurate
-V2 bezel is more accurate (numbers go almost to the edges of the bezel like gen, and the numeral one has the correct shape), but engraving is not as crisp as the V3 tough. EDIT: the V2 also has the "B" on the bezel stamped like gen, vs etched on the V3.
-V2 pushers are more accurate
-V2 dial is more accurate (logo is bolder like gen), but the lume triangle at 12 is a bit worse (if you plan to relume it, it doesn't matter...)
-V2 bracelet endlinks have the serials etched like the gen.
-V2 production year between the lugs is fake and etched w/ incorrect font (no one will notice...)
All in all, when you hold the gen and rep in your hand, the rep screams rep, because of the dial. You can't point out a flaw on it what's different, but there's a huge difference, especially on the stamped numerals on the dial. The gen is MUCH crisper.
Hope this helps!
Greetz.