I got a v2 for a friend and I examined it. I had a v1, but no longer do. From my memory, these are the things I noticed...
The sharp inside lug edges were softened up and better overall fitment of the bracelet to the case. If you examine closely, you can see they slightly sanded down the edges.
Bezel tightness was improved and with nice clicks. The pearl is slightly different then my v1. My v1 had a filled in lume pearl and this v2 has a more recessed lume like the gen does, but the pearl holder shape is still not like gen.
Noticed the crown height when unscrewed was slightly lower to more gen height. The crown engraving does look thinner and not so engraved, but the v1 was too engraved and thicker then gen.
Now for the crystal...I can't be for sure, but I think its been changed. I remember the v1 had a slight different shape along the edge, the v2 is more rounded edge and lower profile.
v1
v2
gen
v1