That is a cool shot. I'm very fond of the Tamron in the transition zone, and this shot shows that quality.
I have been pretty happy with the Tamron. It's my 2nd copy. The 1st was atrocious, but this one is a keeper. Paired with the 6D, I have so many lighting situations opened to me. Funny enough, it was your articles that got me to not go for the 5DIII and the Canon 24-70, so thanks.
Unfortunately sample variation seems to be an issue with the Tamron, but it is my opinion that it is a lens worth getting a good copy of. Mine is fabulous, and it looks like you've got a good copy, too.