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I've got a Sony A7s, and I've also used a friends 6D a fair bit. The A7s is definitely better for low light work with higher dynamic range at high ISOs than the 6D. I also think the A7s has better image quality (though I'll admit that even though I've used better glass on the Canon I've never used the same glass on both). However the 6D is higher resolution and the controls/menus on Canon cameras are lightyears ahead of the Sony, though IMO I can live with it because of the performance of the sensor.
Software wise I agree with H that more software will support the 6D for capture but for processing it's going to be about the same I think.
In terms of lenses that's actually something I've been loving with the Sony is that, as it's mirrorless, I can get adapters for basically any lenses. I can use EF, manual FD or manual Nikon lenses with my adapters (though you can get adapters for Nikon AF lenses too), which means it's possible to pick up great old manual lenses for little money these days. I also have a couple of native FE lenses which are great too.
Also I've got a friend who has one and uses all his Leica lenses on his.
Bottom line is they're both great cameras each with pros and cons and the choice of camera for low light is, IMO, between these two.
Personally if I was looking at a Canon I'd be looking at what they're bringing out in the near future as the 6D has been around for ages whereas the Sony is much newer.
If the resolution of the A7s is too low for you then check out the A7r-II, it still has excellent high ISO performance but with a 36mp sensor.
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