In reply to Robert Durran:
On the Kirkpatrick article - I read it but managed to miss the recommendation for a camera that isn't an SLR. It was what actually prompted me to post as there are certain requirements of cameras you're planning on taking into the mountains, notably the quality of their performance over variable light conditions - which you don't quite get in normal reviews.
That is the only issue with the Mark 3 - the competition at the price point. For that amount you could get
http://www.amazon.co.uk/Sony-Interchangeable-Digital-Camera-16-50mm/dp/B009... (sony Nex 6), for example. Another excellent Sony camera which both lacks touchscreen controls and has an electronic viewfinder (both big plusses for me). The only issue with it being anecdotal reports that it's not the most durable thing around.
A second hand the mark 2 and the nex 6 are about the same. Or there's the G7 X, also a 1 inch sensor point and shoot (lens looks superior , battery apparently worse, since I haven't used either I'm only able to judge from reviews) and the sony a5100... (that all assumes that I'd buy at that price point and not pick up a second hand m2 for significantly less).