6D or 5D Mark III

6D or 5D Mark III?

GO!

(I currently have a 5DII)

I thought you also had a 6D as your backup..... and you're leaving the Sony A7ii out of the equation.

I've got a Rebel T3i as a backpacking/backup...(It's incredibly light)

I didn't want to rule out the Sony, but but the A7Rii is way out of my price range, and there is the issue of lenses.  I've got a bunch, and I'll take a real bath when I try to move them out for Sony versions.  Adapters are an option, but seems that they need some refinement before they're ready for prime time.  I'm also hearing that Live View on the Sony's isn't as good as on the Canons,

Between the two...6D. Especially if you are mainly a landscape photographer. However for daytime Landscapes I don't think either offers much over your 5D2. Now ifnyou are doing more nights/ Milky Way images the 6D is pretty awesome. My alternate would be a Sony A6000 mirrorless. It compliments the full frame nicely on size and image quality. I have a Canon 5D2 , a Sony A7S and a Sony NEX 6. Love A7S for nights but only use it with Canon glass via Fotodiox adapter. Works OK that way. It's bulky but so are are the Sony zoom lenses for full frame. The Sony crop sensor is a better overall system as it is more compact. To try something a little different for the A7S I got an old Nikon 20mm f/4 lens for landscape use. Much better size than a Sony zoom. See attached comparingnall three.

Thanks Darren! 

I do mostly daytime stuff, but do want to expand into star photos.