I prefer the gen2 over the outgoing model.
The main things that I really like about the gen2:
1) The bracelet has the ability to hang straight down, making it wear and look right for people with smaller wrists like myself (16.5cm). The newer model sticks out of the width of my wrists despite technically being smaller by 1mm due to the flare of the bracelet as it transits from the lugs. When you try both on, it is immediately apparent they wear very differently. I'd say it wears about the same as a 40mm Rolex.
2) The thinness of the watch at 9mm. It feels almost as thin as my Nautilus. It's a unique feeling. It's heavy, it's broad, but thin at the same time. A very comfortable wear once you size it correctly. I wore it 1/2 link too tight for some time, and after I added 1/2 link, it easily became one of my most comfy watches. The clasp takes up quite a bit of space, so when you first size it, you'd tend to size it slightly smaller than necessary.
3) The guilloche dial which the gen3 doesn't have. But this is probably an old-man preference. I just like the fact that someone spent decades of their lives learning to guilloche something, and I'm wearing that on my wrist.
4) This applies to the gen3 also: it's 150m water resistant, which makes me want to wear it even more roughly than my Rolex's. Again, strange feeling since it's much more finely finished than a Rolex but yet encourages you to thrash it.
5) This applies to the gen3 also: the coherency of the maltese cross motif across the entirety of the watch. The attention to detail of how the motif is applied is very enjoyable.
Things I don't like about it:
1) The date window position. At 4.30, the position feels strange to me.
2) The date size. I find it impossible to read in darker lighting as it's so small (younger people with better eyesight wouldn't have this problem)
Things that don't matter to me:
1) It's much more anti-magnetic than the gen3
2) It's got a JLC derived movement