There is a known black level issue at least on *some* of the G10s that have been sold. It might let the wind out of your sail at least a little, depending on how picky you are regarding maximizing the black levels for viewing. Pop over to AVS forum in the plasma section for more details. Other sites have covered it as well.

That said, both HDTVs are quite good IMHO, and have PQ which tends to blow away the majority of the LCD models currently sold. Which one has the most 'real' picture is always going to be subjective. The content you watch plays a huge role (cable or satellite, Blu Ray, standard DVD, Standard definition vs High definition, etc.). One size fits all really isn't possible as such.