I will await test results, but, another thought on the 11-24 f/4, it may be a great starscape lens. If you follow the 500/ focal length rule of thumb, that is a 45 sec exposure before you start seeing star trails. So, a bit less than a 1/2th stop more light than I get with my Rokinon 14 mm f/2.8 (or the Nikon 14-24) or a bit more than a stop of light compared to a 24 mm lens.