So I've been looking at a wildlife lens to replace the Nikon 70-300. I was looking at the Sigma 100-400 until I saw a couple of reviews of the Tamron. Dustin Abbott was one, yes, he's a Canon (Dark Side) shooter but does excellent real world reviews. $799. with a free Tap In Console! And it's a very sharp lens according to reviews. Just wondering when Tamron will release it.