No clue, I also question the results of some tests... Biased maybe?
Either way, PS3, only reason it got out the way it did, is because of Blu-Ray, and the firmware is upgradable when it comes to Blu-Ray, the other players, that are standalone, aren't capable of getting the upgraded firmware from Sony, AFAIK.
Take the blu-ray function away, and PS3 sells will drop, and I can find Blu-Ray players for cheap, sometimes $100, and have found a few deals on internal Blu-Ray drives for my pc at $50, so, if you know what your looking for, and get lucky, you can find really good cheap Blu-Ray players.