Update: Please check out the newer post http://camahoy.com/2014/01/13/finally-tamron-150-600-vs-canon-400-f5-6l/
The weather is so bad this year. No sun, no snow, just grey clouds. Thats why this was shot at ISO 3200. I promise you to make something at ISO 100 or similar, wont make much of a difference.
The Canon lens doesn’t have a UV-filter anymore, from the initial test in my appartment, they looked equally good when UV removed. But outside, the same thing appears again, Tamron looks sharper.
Ive tried to test out the auto focus as well, but there simply aren’t that money birds around this time of the year. But all i can say is that it does hunt sometimes, but so does the Canon. It take a while to figure out how a lens behaves, so i need more time for a verdict.
I promise to update more as soon as ive got something to show. I work crappy hours for me to do day light shooting the next few days. But i will borrow a Canon 70D to show how it looks on a crop sensor for the people rocking the 7D and similar.