Just recently watched this review made by Matt Granger. The Tamron looks promising, although it was compared to a Nikon lens on a Nikon body, anybody who is waiting for this lens to mount it on Canon can get an idea on how the lens performs. Here is the link.
https://www.youtube.com/watch?v=fbs4VYlkMjM
https://www.youtube.com/watch?v=fbs4VYlkMjM
