My parents visited me at home yesterday. FIY, I have upgraded to Blu-ray last Sunday

(60 Gb PS3). It is hard to impress them as generally they do not mind so much quality of movies but the plot. Indeed, they were very impressed.
I first showed them slides of my daughter's pictures since her birth till date, and quality was very nice despite the huge size of the pictures. They enjoyed them a lot!! Then we watched some scenes of Ice Age 2 on BD and they were blown away by the sharpness and colorfulness of that movie!
Some scenes of King Kong on DVD followed and it just looked great (very good movie for FP demonstration).
BDs look better than DVDs, but DVDs can look extremely good in a good setup, so I won't be changing all my collection to BD.
I would like to buy Planet earth on BD... Does anyone have it? I watched the first Disc on DVD but PQ was not good. Is it different on BD? Pls advise!