One of the easiest ways to substantially improve the image quality of your daytime cityscapes is to use a circular polarizing filter. Putting a polarizing filter on your lens is like wearing a pair of polarized sunglasses over your eyes; the polarized glass blocks random light waves from passing through, creating a clearer image. Randomized light tends to be lower quality than direct light. As such, a polarizing filter will help ensure that only the sharpest, most colorful light hits your image sensor.
