The compression on Direct TV means blu-ray will always be better quality.
It will always be technically better, but will it be noticeably better to the human eye? And the OP's wondering if it would be so much better that it would be worth renting on BD even though he's already seen it on DirecTV. Unless someone's seen both, I'm not sure if he'll get a good answer to his question.
Planet Earth in particular has lots of upscaled sequences, and much of the HD sequences were shot on first generation HD cameras which often shoot 1440x1080, and suffer from chomatic aberration due to inferior lenses.
I don't really get why people say Planet Earth is an amazingly good looking BluRay when actually it's one of the least impressive titles I've ever seenI think it's more to do with the footage itself, instead of the quality of said footage.
So, in this case, you won't loose too much when watching on something like DirecTV, even though they do some fairly brutal MPEG-2 compression, and probably encode / broadcast it in a 1080i wrapper instead of at its native 1080p24.
I don't personally think it's worth watching all over. That's just me
~MiSfit
I don't really get why people say Planet Earth is an amazingly good looking BluRay when actually it's one of the least impressive titles I've ever seenI think it's more to do with the footage itself, instead of the quality of said footage.
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I don't personally think it's worth watching all over. That's just me
~MiSfit
I sit about 8ft away. I have a 46" 1080p Samsung LCD. A LN46A550 to be exact.