Very good lens for cityscapes.

Quality construction and lightweight, it doesn't tire at all and easily finds a place in the bag.
Very sharp in the center, the edges need 2 stops to catch up.
Not fast in AF but can focus from very close (macro 1:2!) and probably the long distance the motor has to travel prevents it from being fast.
Not an action lens but for static subjects, it's fine.
There are better lenses for landscape due to significant vignetting and distortion, but for cityscapes, it is very good and convenient

Very good lens, the price is a bit expensive but worth it. The only negative thing is that when it focuses, it makes noise and can be heard on the camera's microphone.