EF 100-400mm f/4.5-5.6L IS USM lens or EF 70-200mm f/2.8L IS II USM lens with a Extender EF 2x III?

Started Jan 21, 2013 | Questions thread
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masud37
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EF 100-400mm f/4.5-5.6L IS USM lens or EF 70-200mm f/2.8L IS II USM lens with a Extender EF 2x III?
Jan 21, 2013

I am now using a canon EF 70-200mm f/2.8L IS II USM lens and a canon EF 70-300mm f/4-5.6 IS USM with my EOS 5D mark III body. But I want to update second telephoto lens (EF 70-300mm f/4-5.6 IS USM) with a new EF 100-400mm f/4.5-5.6L IS USM. But I also thinking to buy a Extender EF 2x III to use with EF 70-200mm f/2.8L IS II USM lens. My question is which option can give me better outcome in picture quality and performance: EF 100-400mm f/4.5-5.6L IS USM lens or  EF 70-200mm f/2.8L IS II USM lens with a Extender EF 2x III?

I would like hear from the dpreview members for their valuable suggestions and recommendation  regarding this matter. Thank all of you so much in advance!

 masud37's gear list:masud37's gear list
Canon EF 35mm f/1.4L USM Canon EF 16-35mm f/2.8L II USM Canon EF 70-200mm f/2.8L IS II USM Canon EF 24-105mm f/4L IS USM Canon EOS 450D +6 more
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Canon EOS 5D Mark III
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