Thanks for your feedback,
check the first post for updates.
Like the colors at night, too. But will do both versions in the end i think. Perspective though.
Those first pics were just 25 samples with cycles, so they were a little noisy.
For the letters i have two lights, a plane for the gradient specs and a sun for the subtile dropshadow and additional specular highlights on the chrome material.
The buildings receive environment lighting in addition to their emitting materials or spotlights.
Feel a bit like i already have gone overboard with detail on the buildings. Or maybe i should add even more for a High-Res version. Some people and cars driving along?