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70-200mm 2.8 IS II vs 100-400mm

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I have an interesting dilemma that I’d like all your experts opinion on. Quite recently I’ve upgraded from a Nikon DX camera to a Canon 5DIII, what a joy this is! Only I have to, of course, get a complete set of lenses as well. Since my name is not Rockefeller budget is an issue.
What I already have is a 50mm 1.4 and recently I bought the 17-40mm 4.0. I’m really pleased with both lenses but I miss a telelens. My primary use would be for travelling, I do get to go to the Kruger National Park in South-Africa every second year so I need some range, I want to use it for other travelling as well as sports events as well. My thoughts move between a 70-200mm II lens with a 2x convertor for the long range (don’t need it all the time) or a 100-400mm lens. I’ve read on this site that there’s a rumour that this last lens might be replaced soon, is this worth waiting for?
 
I have had 100-400 for many years and 70-200 II (+1.4 II Ext) for 6 months - used on 7D/5DIII. Better AF for moving subjects, marginal IQ difference at 400mm and its lower price are the only advantages with the 100-400 over the 70-200+2x. The 100-400 does noticeably vignette at 400mm/f5.6 on FF. For most uses in the 70-200's range it gives you the f2.8 advantage and better handling, IS and IQ. Whilst the 70-300L is another option with better IQ than the 100-400, it lacks the range and option to use extenders. The larger aperture of the 70-200 is still more appealing to me. Rent a 500/f4 for those rare safaris.
 
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sk said:
I have had 100-400 for many years and 70-200 II (+1.4 II Ext) for 6 months - used on 7D/5DIII. Better AF for moving subjects, marginal IQ difference at 400mm and its lower price are the only advantages with the 100-400 over the 70-200+2x. The 100-400 does noticeably vignette at 400mm/f5.6 on FF. For most uses in the 70-200's range it gives you the f2.8 advantage and better handling, IS and IQ. Whilst the 70-300L is another option with better IQ than the 100-400, it lacks the range and option to use extenders. The larger aperture of the 70-200 is still more appealing to me. Rent a 500/f4 for those rare safaris.

Hi SK, thanks for sharing your experience, really helpful for me. Clearly I still have some thinking to do (and money to save.... :P)
 
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The 70-200 f/2.8LII lists for $800 more than the 100-400 ($2,500 vs $1,700), adding a 2xIII extender ($500) puts you $1,300 poorer with the 70-200. Also, when there is a new 100-400, it will likely rival the 70-200 f/2.8II in price.

However, if, for you, the cost is not a problem, and the 201-400mm range is "occasional" use only, the extra two stops of aperture, coupled with outstanding IQ sans extender, and very recent IS/AF systems would suggest the 70-200 f/2.8 II is the lens of choice.

I've been using a 100-400 for about two years, and while I love it for wildlife, there are times I'd rather have had faster AF and/or better IS. The 100-400 is a 15-year-old design, and sometimes, it shows.
 
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