Quote Originally Posted by Kayaker72 View Post

If the optics and AF are even close to the other lenses in this weight class, this is a heckuva lens. I would definitely consider it. Along with my budget and other options.
By the charts it will not be close to the 300mm F/2.8 II with a 2x at 600mm.
The 300mm would be the better choice but the $4600 savings could take you on several cool trips with a cheaper lens.