I have IWC 3717 v1 and v2 sitting around so I just going to do the comparison between them. v2 on left and v1 on the right for first pic and second and for third pics v2 on the right and v1 on the left. Also I lost the 9 o'clock marker on v1 dial.
First difference is the lume, v2 dial have lume on all the no and 12,3,6,9 markers and the lume is blue where v1 dial has lume on 12,3,6,9 markers only and the lume is green. The v1 is closer to genuine dial. A few peoples saying that the v2 have thinner markers on 12,3,6,9 but the truth is there is no diferentce in thickness of the markers, it looks thinner because the side of the markers is black instead of white like the one in v1.
Another difference that I found is the subdial rings on the v2 is wrong. 12 and 6 subdial has very large ring and the groove on the is very shallow compare to v1. I'm not sure if this only happens to my one. So can someone with v2 dial reconfirm this.
Also I have another 3717 dial modded by The Zigmeister so when I receive them I will do another lume comparison.