Matt, I am not that critical, when it comes to PQ, as some make it all out to be. I can tell the difference between providers, when it comes to hd programming. As for the Sony & the Roku, I can tell the difference between them, but I do not begrudge my choice in which set has which unit.
As for the Sony, I have never had any of the problems with it, when watching blu-rays, or streaming video. A lot has to do with quality of the stream, which I would say that Netflix has come a long way in a short while, in allowing the U.S., now to be able to change the quality that a person wants.
One thing that I have noticed, is that Netflix, will use varying bit rate on their streams, depending on what is happening. Watching The Expendables, some scenes are running 6meg, others around 1.2, so yes they are doing some creative algorithm, when it comes to their service.