Honestly, I do not think there is even a question here between the listed cameras. An APS-C sensor is better. samsung has also just released a camera similar to the sony NEX at least sensor wise.
Tip: when all else fails - refer to DpReview
Yes, I have been studying dpreview...to be honest the Sony does not get the best review...
Can't wait to see a full review on the GF2...
I think I am leaning toward the GF series..
Tx, Bill