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The current king is almost certainly going to be the new Sony A7Rii.
It is backside illuminated 42.4mp full frame. (its a new sensor and not the same as the 36.4mp sensor in the current A7r model). It has 399 on sensor autofocus points, internal saving 4K video. It looks to be a stop better high ISO performance at least over Sony A7r which is similar to 6D and clean at ISO6400 so expect ISO12800 to be the new ISO6400m which a number of cameras have achieved in the last few years. The camera has IBIS which is a 5 axis stabilisation on the sensor itself so even legacy lenses can now have stabilisation for daylight shots.
I don't know but perhaps 4K video could be handy for planetary work.
You can use any lens on it. The other interesting feature is that autofocus on a Canon lens with a Metabones or other adapter is supposed to be almost as fast as on a Canon body. So you have access to all those great Canon L lenses yet the cutting edge sensor of the Sony. You can have your cake and eat it too. Its expensive at $3800 though. Some of the Zeiss FE lenses are way up there in top line quality and at least one is a dud.
Or a Nikon D810a which is the astrophotography version of the D810 much like Canon has done with 60Da. It has some cool features in it and is the Sony 36.4mp sensor (same as A7r) in case you don't like Sony.It has one stop better high ISO performance and 4 or 5X better Ha response than D810 plus it has built in up to 15minute exposure times and better LCD dark scene response for focusing (so does any A7 series with its electronic viewfinder which is much better to use than an LCD live view).
The main advantage of the D810a is its a full frame astro cam rather than the usual APS 20Da or 60Da.
A modded 6Da may be better value and do really well though but perhaps not so good for daylight shots.
Canon still has the most software backup for tethering etc. but I believe you can tether a Sony A7 series cam now with latest software.
Greg.
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