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I've used Nikon D800e, Sony A7R11 and !!! and a Canon EOS R(a) full frame cameras and several Fuji X cameras - XE2, XT1, XT2 (APSc)
For nightscapes you do get a more engaging image using a full frame. I have setup the Sony alongside the Fuji and shot the same scene and the Sony image was the better.
But taking into account budget and full frame starts to be an expensive proposition.
There are very few wide angle lenses that perform well on full frame. for nightscapes, very few and they are all quite expensive with Samyang being the exception.
A bit easier with APSc.
I am familiar with Fuji APSc so I will comment on them.
Fuji lenses are up there with the very best. Zeiss like.
The stock 18-55mm zoom lens works great wide open. The Fuji XF 14mm F2.8 also works almost perfectly wide open (a small area in the corners is off but not by a lot.
There is a Fuji XF zoom its something like 28-50 F2.8. That is a stellar lens.
Fuji XF cameras are quite good for nightscapes as they use the Sony backside illuminated sensors. In the XT series there is some funny business to do with noise reduction on RAWs like Sony does so stars are slightly manipulated. Canon and I think Nikon are the only 2 that don't monkey with the stars. Even then that may be model dependent with Nikon.
Sony has the famous star eater issue. It will mistake faint sharp stars as hot pixels and try to remove them which ends up with a bunch of green stars. Fuji XT3 or 4 (there is a thread about it on the DPR Fuji forum about it) does something similar. Star eater started with later models, A7 should not be affected.
Fuji is a good choice overall as apart from the star eater which is lot less of an issue compared to Sony the camera has a lot of features that is astro friendly.
Say Fuji XT2 or above you get a timer for exposures up to 15 minutes in camera without needing an intervalometer.
Fuji uses the latest Sony sensors so the sensor is high tech and low noise, very sensitive.
Canon APSc though dominates the APSc market for astro use.
Greg.
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