Hmmmm...Just been reading 'Zero black level PDP research' and from what I have read, the Panasonic black level issues all revolve around the manufacturer trying to achieve high efficiency, reducing power consumption. This must be in relation to the 'eco' movement.
Other manufacturer Plasma screens may not provide the deep blacks that Panasonic achieve, but Panasonic blacks are artificial, which gives the 'floating black' effect.
I think I would rather opt for a display that has natural, consistent blacks, that does not rely on artificial processing to shift the black level in such a poor way that it becomes a distraction.
It appears that Pioneer do not use artificial processing to achieve deeper black, rather, they have re-designed the actual plasma panel structure.
At the end of the day, power consumption is the selling point. Power consumption will be the selling point for OLED screens.