Thanks for posting that link Peter. I've seen Eric's site and images before and have been amazed with what he could achieve in one of the most densely populated cities in the world. After having just watched that short I admire the guy even more.
For me the message is that you need good equipment and persistence. Being forced (by the heavy pollution) to concentrate on just a few planets probably helped Eric get so good at imaging them. Deep space must be non-existent in HK.
Eric's Jupiter shots show incredible detail. They are a must see, so if you haven't seen them before, check them out
here.