Sigma 100-400mm f5-6.3 Fujifilm X-mount vs Fujinon 100-400mm f4.5-5.6

The newly announced Sigma 100-400mm f5-6.3 does a lot of things and it does them well. But when it comes to Fujinon and specifically the Fujinon 100-400mm - is it worth the while? And price wise, can you compare them really?
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