With a set that big, you probably will notice a little increased definition over a 720p set, but not much.
As far as color/black levels, I hope you notice a difference. Please report back and let us know.
I will be especially interested in learning if you notice any weird artifacts when watching material in 240hz mode. I find the video interpolation software on some sets (used to increase a normal 30 or 60hz signal) introduces funny looking screen effects, where the foreground appears separated from the background.
