New body for low light

ThrillaMozilla wrote:

Not all the full frame cameras are equal. Some are much more equal than others. But the 80D has Canon's best APS-C sensor without doubt. It's supposedly about equal in dynamic range to Nikon D5300. I think that translates in this case into equal noise at high ISO, but I'm not entirely sure.

Dynamic range as has been discussed ad nauseam is almost exclusively at base ISO. High ISO performance isn't directly related. You can see this in the DR vs ISO charts here...

http://photonstophotos.net/Charts/PDR.htm

Where some Canon cameras lose the DR battle at low ISO but win it at higher ISO.

Anyway, the 5300 seems slightly better a noise performer to me than the 80d, but they are both pretty good aps-c sensors and they both will get trumped by say...the 5Dmk3, 6D, or 5Dmk4.

Low light usually means bad lighting, I'm a fan of pointing out that you can have low light that is compelling and creates shape, or you can have low lighting where no attention is paid to lighting. In the former you want a camera like the 6D or 5Dmk4, etc...to keep noise under control, in the latter you want to add light. Honestly I'll add light whenever possible anyway, and I'm shooting a 5D4 at the moment.

If OP wants to stay in Canon-land, and the 6D can handle the types of photography required, it's a good option right now.

Also looking at the lenses listed for OP, perhaps some faster lenses (primes) would help out quite a bit. while you can get 1.5 or so stops of improved noise performance by changing bodies, if you are shooting at f4 and an image would work at f2, that's 2 stops right there.