Simply amazing. The picture quality is absolutely breathtaking! There is so much detail in the picture. It is probably the best looking blu-ray I own (and I own loads). This is probably even better quality than Planet Earth which is also very detailed and sharp. This is a quality series with some incredible human stories and bizarre rituals from tribes around the world.
The picture is 1080i like Planet Earth because that is how it is broadcast by the BBC. This isn't a movie, its a documentary! 1080i is better suited to documentaries. See this extract from a web article:
"1080i: 1,920x1,080 pixel resolution. High-definition picture that is displayed interlaced. Each odd line of the picture is displayed, followed by each even line, and the resulting image is not as smooth as a progressive feed. 1080i is therefore a more detailed picture suited to documentaries and wildlife footage, but less suitable for action-oriented material such as sports and movies."