I guess little things do mean a lot
It has only been about 1.5 years since I bought a 5D MKII and I really was impressed at the time. When the 5D MKIII came out and the specs seemed less than many hoped for, I planned to skip that upgrade until I damaged my 5D MKII.
After considering going with the D800, I reluctantly fell back to the 5D MKIII because of collection of compatible Canon gear.
After the first few days of having the 5D MKIII, I knew I had good luck in my choice. I love this camera! And quite a bit more than I liked my 5D MKII. But why?
I think it is because of the little things that add up to being very close to exactly what I want in a camera. Little things that I never knew I wanted until I had it, like the locking mode dial and silent shutter. I love the color and IQ. Every shot is always a keeper unless I really mess up something.The improved ISO performance is useful to me.
And the not so small thing is the AF, which I think is something I couldn't live without now.
I think there will always be more glass I would love to have, but right now I'm not wanting another camera body. For once, I'm pretty much content with the 5D MKIII. Strange, since it is a camera body that I didn't intend to buy. This was one time I was guilty of judging a book by it's cover.