Smaller camera than my 6D

[Willis]

Is there a camera that is...

light and smaller than my Canon 6d + 17-40mm which is
Good in low light
Shoots wide for landscapes
Shoots HD video with auto focus
Flip out rear screen.

Hard task to ask for all of the above but need to find something lighter for hiking.

 

[Willis]

Thanks for all your advise and options but looks like i'll stick to carrying the 6d and 17-40. My bag when walking is about 15kg so not worth changing it if i'm only going to be saving a little weight.