What's your opinion on the Canon EOS 6D?

It’s a nice and well-respected camera. But it isn’t as nice as a dedicated Astro camera.

A dedicated Astro camera has controlled sensor cooling to reduce noise.

A dedicated Astro camera can be bought in Mono or color RGGB.

A dedicated Astro camera has no moving parts. (very important)

Early on when I was researching my first equipment for AP I considered using my DSLR. But there were so many reasons to just get a regular Astro Camera I went that way.