I am only curious, but has anyone ever really done a true comparison in performance between these two lenses (and the 300's as well)? I just wonder if there are actually any in-the-field performance differences. The ISO comparion charts look very similar. I was just curious. Thanks.
Hi bdunbar79, I've owned both the 300f/2.8 & 400f/2.8 Version i Lenses & currently own the same two Version 2 Lenses.
I cant do a side by side comparison as I sold the Version 1 lenses to own the version 2 lenses, but these would be my thoughts on the two versions.
IQ: Difficult question, looking at my own shots and I haven't a clue about all the charts & stuff, but just blowing up and looking at Version 1 lenses IQ compared to Version 2, there is not too much difference in IQ, if I had to say one or the other I'de say Version 2 is better, but damn hard call.
Weight: well that's easy, the 300 & 400 Version 2 Lenses are a Dream, the 300 is now a 100% hand holdable all conditions Lens, the 400 spends most of it's time still on the monopod or the Tripod (because I'm damn lazy), but it's Hand Holdable for short periods, the Version 1 400 just wasn't unless you had Arnold as a Sherpa.
Focus: the Version 2 Lenses just snap on like the Version 1 lenses didn't, I get very few OOF Shots with the Version 2
I've never for a moment regretted going from the Version 1 to the version 2, if you can get past the price, there's no contest, just the weight alone did it for me, but the upgrade in ability to Focus faster and marginally better IQ, were simply nice to haves.
My own shooting shows I use the 300 slightly more than the 400 (Wildlife), and I pick up the 200-400f/4 (1.4x) in June, the Lens I'll be selling will be the 400f/2.8 v2, not at all because it's not a great Lens, it is, but the versatility of the 200-400f/4 for my own Photography needs will lean more to the versatility (but slower) 200-400f/4 than the 400f/2.8.
So if your in Singapore in the next month or two or three, there's a 400f/2.8 Version 2 looking for a home.
I'm sure you've read this, but if not it may answer some of your questionshttp://www.the-digital-picture.com/Reviews/Canon-EF-400mm-f-2.8-L-IS-II-USM-Lens-Review.aspx