A shame the woods were completely deserted - as is often the case here.
As to the 5D vs 6D, it's been enjoyable having the chance to compare them. There are certainly differences, with the 5D have a subtly warmer, richer colour balance - the 6D is cooler although not as much as, for example, my Nikon D700. What I like so much about the 5D is the tonal transitions which are incredibly smooth, looking just wonderfully natural - a character it shares with the D700. I'm quickly arriving at the conclusion that there's something rather special about a FF sensor with 'only' 12MP. There's a pop to their images which is undeniably pleasant.
Technically, even though it's an old design c/w modern stuff, the 6D is hugely better - low light/high ISO is of course one area where it wins out. I have done a few shots at ISO 1600 on the 5D (its native limit) and whilst yes, it is noisy, there is a pleasant look about the files - especially in mono. It's advisable to keep it to 800 if possible though. The D700 is about the same at 6400 where its noise pattern is also quite benign.