What are the cons of using a 3rd party 70-200 f2.8 EF lens with an R7?

What are the cons of using a 3rd party 70-200 f2.8 EF lens with an R7? Currently in the market to upgrade my current RX100 to a more capable sports photography setup (indoor and outdoor) - I've got my eyes on a used R7 for $850 and the Sigma 70-200mm F/2.8 DG OS HSM Sports w/ the EF mount and Canon's EF-RF adapter. Would the AF performance take a significant hit considering that it's not a native lens? And if so, ...

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