We always want new cameras. Digital SLRs and all their fancy new features and specs get all the attention. But it's rare that a new camera can really offer you a new way to be creative. A new lens almost always offers new ways to express yourself and solve problems. Lenses also last. I've had my Canon 70-200 f/2.8L for about 12 years. I don't even know how many cameras I've gone through in that time.

So yeah - get a new lens. Sure, a new camera would give you some more speed and better low light image quality. But a new lens will let you see and shoot things in new ways. A new lens will really help you grow as a photographer. You can always buy a new camera later. But the lens will make a big difference as soon as you slap it on your camera.