With the availability of advanced stacking/panorama programs such as Sequator, and the ability of many cameras to image at ISO settings up to 10000, you could possibly go to longer focal length lenses such as the 35mm f1.4 options from Samyang & Sigma.
It requires more work in processing and the stitching of far more panels to create your final image but you'll get much higher resolution images.
It seems to be the way many of the advanced nightscapers are going - just something to consider.
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