Since this question comes up now and again, I decided to put together a comparison between the latest Sony FE 70-200 F2.8 GM II lens with the 2x teleconverter attached (400mm, f/5.6) and the FE 100-400 GM F4.5-5.6 lens also at 400mm, f/5.6.
Surprisingly it's extremely close between them...
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