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Sigma issued a declaration of war against Nikon a few days ago.
Instead of porting their three f/1.4 primes to Z-mount, they ported them to L-mount instead. A mount without any APS-C cameras will be getting those APS-C lenses instead of Z-mount.
This means Sigma believes they can steal the Z50 cake and supplant it with an APS-C camera of their own.