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Agree with Hugh - the photo isn't that bad. I also agree that the lens is pretty slow, but that's not all bad news either. If you are going to have reasonably sharp foreground objects (in this case the tower/roof), you might actually find that hard to achieve with a fast setting. Sure, f/1.8, say, lets in heaps more light, but below f/2.8 or thereabouts you will struggle trying to get the stars AND foreground acceptably sharp in the same shot, especially with close objects. The depth of field is just too small at low f numbers. The irony is that you might still end up having to combine several frames to get a pic with sharp, bright stars and a sharp foreground. To me the main advantage of a fast lens is the fact that you can stop it down to make it sharper without losing too much aperture. Not because it's a general silver bullet for low light scenes. Because it's not.
If I were you, I'd try the recommended things like cooling, stacking, noise reduction etc & push the gear you have to its limits before spending dollars on a new lens.
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