Well, I've taken the leap to full frame.  The 5D III and a nifty "L" lens now share a spot next to my 70D.  I'm enjoying the new camera very much, and even managed to take a few portraits with it.  As always, there is a learning curve, but its fairly intuitive.  I was pleased to find I didn't have to push the images as far in post editing.   Particularly the images that were captured in lower light.  It will be fun to try it out on some long exposure and landscape shots.  Now, to find a few filters...