In reply to Dan Bailey - UKHillwalking.com:
I used to use a mk1 rx100 and now use an lx100. I am sure the next rx100 is a lot better, but having seen one last week, it is also a lot bigger than the first version which in my optinion makes it lose one of its key advantages.
For rock I find i am now far less likely just to clip the camera to my harness as it's much bigger, although it is still not that big. While out and about in the hills I much prefer the slightly more bulky lx100 due to better image quality (in my opinion), and the really easy to use dials to control the exposure. (I did find I could mostly control the rx100 in gloves in winter, but some things were certainly annoying to do in gloves. althoguh this can be said for some of the deeper settings on the lx100 as well such as white balance, focus mode etc.)
The lx100 doesn't have a very big zoom range, but I tend to mainly use it wide anyway. The extra 4mm at the wide end (24 vs 28) is also useful on the lx100.
I don't tend to use the electronic viewfinder, but having seen my friend use it on the rx100 mk3, it looks like a lot of faff to just use as its not just ready, while on the rx100 it is just ready to use when you put it up to your eye.