If you really want Canon then the original 6D is a winner. Avoid the 6D Mk2, it's actually worse (for astro) and more expensive.
If you're interested in a Sony sensor and want to avoid 'star eater' issues then check out the Nikon D620, D750 and Pentax K1. The K1 is a superb camera from what I've seen at a very good price point.
Cheers,
Cam
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