I apologize if I made it sound I was positive that I knew there is no difference between the commercial and the consumer. I should have said, I can see no evidence there is any difference between the two.
In response to the 720p scaling issue, this information has just recently come to light and I hadn't heard many complaints from either consumer or commercial users before the HT mag review said there was a problem with it. It could be that this only happens over component and most people use HDMI/DVI so they don't see it, or more likely, that most people didn't notice this so there were no complaints. So I don't think this has been even remotely settled yet as to whether this issue does or does not exist with the comsumer models. All I know is that this board is filled with people that love the consumer panny as much as the commercial panny.
As for the 2048 versus the 4096 grey step processing, you can only get the 4096 with the "upgraded" HDMI/DVI board right? So if this this is the case it is possible they didn't use the upgraded board electronics in the consumer model.
Anyway, as I said earlier, my statements should have been prefaced with that this is my opinion based on all the research I have done on both of the Panny's and all the reviews I have read in this forum other places.