I would agree. Detail on city sceneries is only really useful if the user would be expected to fly closely to the buildings, but with ZBAA downtown is far away. The suer would never even see the detail from that distance.I think may be it is better if we do the city scenery by making boxes, shapes/cylinders for those buildings whithout paying much on the detail. Then come back later for more detail. So, the project can be done at a considerable amount of buildings. If you get bored, the whole city in less detail is still usable rather that scattered detailed buildings here and there.
I'm starting a project for a more detailed Phoenix City scenery, and this is a slightly different story: downtown is on the approach path to KPHX, so having more detail would be good.