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I don't think the encoded level has anything to do with it since I know the software H264 decoders on my computer can easily decode level 5 which the BluRay player has a very strict limit at level 4.1 (it refuses to play the 3840x1080 side by side file, it does not even try).
My guess would be that Sony added extra filters in their player to 'improve" the picture : add extra deblocking if the player detects a lack of deblocking (mpeg 2, mpeg 4 asp, etc...) or an incorrect amount of deblocking in AVC/MVC.
It's just a guess based on experience with TVs vs computer monitors.
TVs tend to have lots of filters because they word all the time with very dirty sources (like low bitrate mpeg 2 HD broadcast).
I guess the same logic probably applies to consumer BluRay players.
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