Munich still has a lot of pre-war buildings in the Altstadt. As with Hamburg, for instance, you can look at the wikipedia list of architectural monuments in the old town district and you can see just how many such buildings still exist. It's a bit hard to compare the lists for different cities, mostly because their cityscapes are characterized by different house types; an elegant early 20th century department store from Hamburg is larger than 6 or 7 town houses from smaller cities, but only counts as one in the list; how the old town district is defined is also debatable. Nonetheless, from the several lists that I scrolled, and accounting for the size and nature of each city center, I think Luebeck, Aachen, Regensburg, Goerlitz, Augsburg, Halle, Munich, Hamburg, Leipzig, Karlsruhe, Nuremberg, Ulm, Bonn and even Bremen and Braunschweig still have a significant number of pre-war buildings in their centers; of course this varies from high densities in Regensburg or Halle to more concentrated pockets in Ulm or Nuremberg, but it's not all THAT bad! And I only looked at a few lists and there are countless other cities, often smaller, that are very well-preserved as well.