Kind of. A few days ago, I was thinking about the 6D again, since it is cheap now and the IQ is slightly better. Also the price of the 5D3 doesn't seem to drop over here. It's just so hard to justify the price of the 5D3 even though I want its AF system so badly. I should go to a store one day and hold both to see how they feel in my hand, but I don't really have time for that now...
The IQ and ISO diff is a wash between the 6D and 5D3 unless you go Nikon
If you want the 5D3 AF so badly, just suck it up and get it.
I used to have the 5D2 and I hated being limited to the centre point, I was never happy with focus recompose with my fast primes. So when I was looking to upgrade, 6D was out of the equation straight away.
And unless you have a girly hand and you are in fact a female, 5D3 feels and grips so much better than the 6D with better (pro) ergonomics.