Planting 2 or more helps with pollination. Some of you may have noticed that in the fist pic there is a tree that looks just like it to the right. The tree to the right is the tree in the second pic.
Wow, cool. I have a client with a European version that looks very close to the ones you posted. The Chinese can get pretty large, I have seen trees easily 45 X 60. I'll post up asap.