It is more than a year after the the-digital-picture review for example and says less and gives less detail in more words. As for focal length, it says nothing about the performance with the 1.4x and 2xTCs, and doesn't even mention the latter. It says that one con is the weight, but it weighs far less than the 400, 500 and 600mm f/2.8 - f/4 primes and gives IQs not much worse than them with the TCs. The reviewer just doesn't realise that the high quality 300-600mm range in a relatively light package is what this lens is all about.
I have to say I somewhat agree with this. I was quite excited to see that a new review of this lens had been posted (though let's be honest we all know what the conclusion is going to be), and wow those pictures of the owls - amazing! But it was written (as he readily admits) by someone that does not really need, or use that focal length on a regular basis. This is a very expensive lens, though still much cheaper than 400 f/2.8 II, so really the amount of people who are "wondering" whether a 300 f/2.8 is what they need are going to be few and far between, as it is so specialised.
I think the reviewer would have been much better off writing about the 70-300L f/4.5-5.6 IS, because they are focal lengths where he seems to spend more of his time, and as it is much more affordable and versatile it has a much broader potential market base.
When I read it, I found this last part of the conclusion very interesting:
And while my curiosity was piqued, I think for the more specialized super-telephoto focal lengths, I should step aside and let someone else handle those reviews.
I agree wholeheartedly.
Reviews are tricky things and my favourites are tdp when it comes to lenses. I do think a lens review should only be written by someone that uses the focal length in question frequently rather than someone who is wondering about the extra reach.
I, for example, am saving for the 400 f/2.8 ii but of course have my eyes open for new reviews on the 300 (hey it's a lot cheaper) and the new 200-400 1.4x (but that is not f/2.8 so I doubt it is a realistic option).
Did I say I love the pictures of the owls! Awesome shots.
Yup, you'll find anything in that focal range covered by someone other than me... it took *that* lens to realize it, though, since I had been pretty good with everything up until then (including the Canon 200 f/2.0 L IS). I'd love to have a look at Sigma's new 120-300 f/2.8 though, since, like I said, having the reach when necessary sure is handy.
Also, putting my money where my mouth is, I ended up buying a 1.4 teleconverter to have with me and stick onto my 70-200 f/2.8 L IS II.
Sorry the article didn't live up to your expectations, I struggled with it as it is, and you'll be in for a treat when the other telephoto reviews come in.