That's a good deal. 85mm on DX would be like using a 135mm on FX so it would be a fine portrait lens, but too narrow a FOV for buildings/exteriors. The 85mm 1.8G is an incredible lens for the money. It compares favorably with the 85mm 1.4G and in a more light-weight and economical package. If I didn't have the 1.4, the 1.8 would be my absolute favorite lens to get or own. When you compare it, on an FX or DX camera, to a 50mm f1.4, for example, you'll see a BIG difference. It is like the difference between the 50mm and a kit lens like the 18-55mm....that much of a jump in image quality. So for portraits there is nothing better. 50mm if fine for portraits if you want to include more context or background but I find I notice the distortion more in people's faces even if I'm several feet away. You can see this after field correction of the 50mm in Lightroom. I don't care who you are, what you shoot, or what Nikon DSLR you have, the 85mm 1.8G is a landmark lens in terms of image quality and bang-for-buck. I even contemplated getting one for my wife to use on her D7000 or as a smaller portrait lens on my FX cameras for when I'm traveling lighter. But try one of these lenses and everything else will be secondary in terms of preference for the best image quality.
