I have owned G1 in black and red nose layup and G2 in red nose layup. I paddled the G2 for a summer then sold it and went back to the G1.
They are both excellent boats, but they are completely different from each other. G1 is a low rocker boat. it has a prominent flare in the bow above the waterline, that to most people's eyes looks funny or ugly. What that flared bow does is add an amazing amount of secondary stability for a boat that is so fast. With the low rocker the G1 is slightly faster on the flat than G2 (not a meaningful amount of difference for most of us). It is also (in my experience) much more stable in confused chop. This is because of the low rocker as well as the flare. In confused chop the G1 almost becomes more stable that it is on the flat because the immense secondary stability is being engaged as the wave peaks hit the sides of the hull. As expected, the low rocker the G1 is not as playful downwind as the high rocker G2. Another common critique of the G1 is that in smaller steep waves, the flared bow provides some resistance to powering through the wave ahead of you. As conditions get bigger and the waves spread out, this becomes a non-issue.
G2 is a complete redesign. it is a high rocker boat meant for downwind. the nose is lower volume and the flared bow is gone. On the flat it is a hair slower than G1. Downwind it is a better ski than G1. The rocker allows it to turn quickly and steer with hip lean more like a fenn or huki. In confused chop it is (in my experience) significantly less stable than the G1, and this is what you would expect based on the increased rocker and the reduced bow flare. Remember the G1 bow flare was not put there to look ugly; it was put there to give immense secondary stability, and it really works.
If most of my paddling was in clean downwind conditions I would have kept the G2. But most of my paddling is flat water or chaotic chop. In the chop I can follow any wave I want in the G1. In the G2 I am too distracted by balance issues to follow the line. So I sold the G2 and upgraded to a red nose G1.
As far as the buckets, the G1 has the traditional high platform epic bucket where you sit ontop of the ski with excellent ergonomics. The G2 has a deep high walled bucket that feels more like a fenn. Ergonomics are still excellent. A lot of people say the G2 is the most comfortable ski they have ever been in. For me the G1 bucket feels more comfortable. in the G2 I felt like my pelvis was tipped back more, and it was harder to get over the stroke. But I have a funny butt and stiff hamstrings, and as I said, the vast majority of people love the G2 bucket.
Bottom line, these are both great boats, but they have different strengths and weaknesses.
Current Skis: Nelo Vanquish AIR, NK 670 double, NK exrcize, Carbonology Feather, Think Jet, Knysna Sonic X
Former Skis: Epic v10g3, Kai Waa Vega, Epic V12 g2, Epic V12 g1, Epic v10 double, Nelo 550 g2, Fenn Elite S, Custom Kayaks Synergy