I think that the reason people are saying the old style has a better trigger is because it is so easy for anyone that can use a screwdriver and a file, to adjust their own trigger.
I would bet that most of the old style frames belong to silhouette shooters. With any kind of target shooting, the trigger is a big part of accuracy. The frame that I use for Hunters Pistol Silhouette is at 10 oz. I know guys that have theirs lighter. You can bang them around too, and they don't go off.
I origionally had both of my frames set at 10 oz but I had too many 357 max and 30-30 rounds go off before I was ready. Nothing dangerous, but if it had been a deer, it would have missed. I got a new spring and quit fileing it off at 2lb. Now the 357 max and the 30-30 go off when I am ready and the trigger is still light enough for good accuracy.
I don't have a g2 and have no plans to get one in the near future so I can't really comment on how easy it is to do your own trigger work but I hear it is not near as easy.
Sixgun