Curiosity: Sigma FP-L with similar (or same?) Sony A7rIV sensor resolves nearly 1 stop more dynamic range

Pphotonstophotos.net measured the Sigma FP-L dynamic range and as you can see it clearly outperforms the Sony A7rIV. That’s a big surprise! What I don’t know yet is if Sigma is using exactly the same A7rIV sensor or ot. I guess it’s pretty much the same and that the improvements are due their own internal processing engine…