Maybe if they painted it white... 
But seriously, if image quality rivals the recent great whites like the 200-400, it might be worth it. I imagine the design/engineering challenges for fast/wide are somewhat analogous to fast/long. I haven't seen a lot of FF primes faster than f/2.8 at/below 14mm so an f/4 zoom is not unexpected.
Still, a bit out of my price range though.
But seriously, if image quality rivals the recent great whites like the 200-400, it might be worth it. I imagine the design/engineering challenges for fast/wide are somewhat analogous to fast/long. I haven't seen a lot of FF primes faster than f/2.8 at/below 14mm so an f/4 zoom is not unexpected.
Still, a bit out of my price range though.
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