This is very crisp. How do you do that?
Dull grey overcast winter skies. Put a 24-70 E on the Df. Snap a picture. Process in PhotoNinja. Post on NG.
By the way, the slight yellowish cast is correct. The air over the city becomes heavily polluted in the winter when the weather is very cold and no winds to shift the pollution. From the surrounding hills you can easily observe the yellowish 'lid' overlaying the city area.