THE bokeh master, the SIGMA 105mm f1.4 DG HSM | A. This lens has a reputation and for good reason. Insane optics that hold nothing back. You can take a look at the corners of the images below shot at f1.4 to judge the incredibly quality of this lens. 

Responsibly for one of my favorite images of Comet NEOWISE from Joshua Tree National Park and 20 minutes worth of shooting the rho ophiuchi complex, this lens does nothing but impress with it's results. That said, to achieve that super fast f1.4 at 105mm, the optics were not restrained at all in terms of size and weight, so while it might make your arms tired,  the wow from the results will more than make up for it.  Of course, the benefit of using this lens for astro is that it's always on a tripod : ) 

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