I emailed Patagonia on the g/m2, still waiting for reply. I recently bought the wool 2 and can't wait to try it on my July trip to Colorado this summer. My only complaint with the wool 2 is a) the price and b) why did they put a big tag in the neck seam? This just adds unnecessary weight and another potential source of irritation for your skin. I also tend to find the seams in Patagonia's clothing (particularly the Capilene 2, 3, 4, etc.) a bit big and irritating.
Oh, and I just ordered the Ibex woolies LS crew for my wife from Backcountry.com. It's 150 g/m2 if I'm not mistaken. (Patagonia wool 2 was not in stock, neither was Icebreaker 150--I prefer to buy from sites with 100% guarantees).