I'm planning to get the 300mm f/2.8 L II next and have saved up for the most part. I'm confused whether I would need the 100-400 after I do get the 300. That said, should I sell the 100-400, I might just be able to give myself an early Christmas present or else I have to wait a few months.
All you guys who have used the 300, have you needed the 100-400 after getting the 300 f/2.8 L II? If so, why?
This is a tough one. I have both the 300 II and the 100-400. Honestly I don't use the 1-4 very much anymore. The images are so sharp with the 300 (even w/tc's) that it is difficult to not reach for it. The other thing is that the AF is so much snappier with the 300.
That said, 100 to 400 is a really great zoom range. If you spend a lot of time hiking or kayaking it is really great to use the 100-400. I think that if this lens gets updated and has better AF and IS that I would go for it. I find my 100-400 plenty sharp so if the performance of the lens could be improved I bet I would have to think hard about which lens to use. (300 II or 100-400 II?)
If it came down to keeping your 100-400 and NOT buying a 300 or selling the 1-4 and buying a 300.... then the choice would be simple for me. Sell the 1-4 and buy the 300. The 300 is THAT good. (In fact if I could only have one lens this would be my choice, at least for the type of shooting I do)