Pluses and minuses of 5DIII vs. 6D???

A link or comments or side by side comparsions would be appreciated. I have old 5D that I seldom use and 17-40 & 24-105. I am an advanced amateur and mostly shoot outdoors--- landscapes & scenics and no weddings or sports. My goto body is 7D + 17-55 and 40D as a backup.

I am thinking seriously about buying one of the above FF's and I will keep the 7D. I'd appreciate reasons for buying (or not) one over the other other than the obvious difference in $$$. One of my reasons is the 7D is over 3 years old and I'm interested in the newer technology.

Thanks in advance,

Kent