Great shots. I was looking at getting the Sigma, but ended up getting the Tamron 150-600 instead. Then I ended up trading the lens for a set of cinema lenses. Now I am going to be getting another long lens in the near future, so I will be back to testing them out again.
Thanks! I've heard that Sigma was better than Tamron's first version of 150-600, but Tamron's second model is a clear improvement to the first one.
The 150-600mm was so huge compared to any other lens I have previously owned I might end up getting a 100-400mm instead. But then again, I might end up disappointed for not getting the 150-600mm one.
Life is full of choices.