thewirecutter.com just updated their best mirrorless camera recommendation to the X-T2
http://thewirecutter.com/reviews/best-mirrorless-camera/
They're pretty thorough in their reviews and recommendations.
I have the 16-55 2.8 and it's not so great for astro. Edges show an unacceptable level of CA and coma. I thinking to get the Rokinon 12mm f2 specifically for astrophotography.