That1cameraguy posted the first two videos about the new Sigma MC-11 firmware and it did a great job with adapted glass keeping up with action. In his estimation, you get 85% of the performance of native Sony glass, which is still very good. The above video is a comparison between the previous firmware and the current one and the below video is the new firmware at a sporting event.
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Sigma MC-11: B&H Photo / Amazon / Adorama
Sony a9 Action Shooting Kit: B&H Photo / Amazon / Adorama
Sony a9: B&H Photo / Amazon / Adorama
Sony FE 100-400mm: B&H Photo / Amazon / Adorama