[DiggerD21]

The Hafencity area (at least the western part of it) is very close to the city centre. You won't find any skyscrapers there. The Elbphilharmonie (which is now officially under construction since monday) will be the tallest building in this area with 110m and it is actually marketed as the new landmark for Hamburg (they are constantly making comparisons with the Sydney Opera). Actually I don't think that skysrapers are needed here to create a dense urban environment.
One has to accept that in Hamburg there won't be any skyscrapers (>150m) in or next to the city centre in the near future, because it is an unwritten rule in the city government that the main church towers (all between 120 and 150m high) should dominate the city centre's skyline. In other parts of the city skyscrapers are more likely (east end of the Hafencity, Channel Harburg...)