The good thing about the DirectX 12 is now that it's implemented on XB1, it will also be implemented on the PC. And in this way, we can actually measure / see if there will be any improvements with hardware similar to XB1. Just you wait. But don't also forget that Sony will be updating their own APIs as well (and history tells us that they are better at it), but it won't just be as publicized.
Playstation 5 vs XBox Series Market Share Estimates
Regional Analysis (only MS and Sony Consoles)
Europe => XB1 : 23-24 % vs PS4 : 76-77%
N. America => XB1 : 49-52% vs PS4 : 48-51%
Global => XB1 : 32-34% vs PS4 : 66-68%