I was in Tokyo two weeks ago.
Among other activities, I could admire the Skytree (634 meters high) and even visited the observatory decks.
What I wanted to say, in comparison with 1WTC, is that: although the Skytree is not a skyscraper, just a telecommunication tower, it has such a unique structure, that it can even look like a skyscraper when it's seen from far away.
Moreover the spire of Skytree is much more thick than the toothpick on 1WTC. That's why I had fun to imagine 1WTC with... the spire of Skytree (on Google Sketchup)
Please let me know what you think about it
By the way, the spire of Skytree is almost the exact same height of 1WTC's spire: it's around 130 meters tall.
http://image.noelshack.com/fichiers/...6-dsc00393.jpg