There are different benchmarks one can pick depending on the article they want to write. Geekbench 6 favors Apple CPUs more that Geekbench 5, which was already better on Apple CPUs than say Antutu.

Antutu CPU - A16 248335, SnapDragon 8 Gen2 268542

Antutu GPU - A16 394336, SnapDragon 8 Gen 2 580101

If You look at Geekbench 5 scores for A16 and SD8G2, A16 is ahead by less than 10%.

Yes, the 8cx Gen 4 will be used in laptops running Windows and (unofficially) Linux.

Nuvia was a company founded by Gerard Williams in 2020 to build an ARM data center chip with a very high performance/watt profile. He was previously at Apple running the chip unit in some of the crucial years for Apple Silicon. Qualcomm bought Nuvia in 2021, and Williams is VP Engineering now. They are going to present the first Snapdragons with the Nuvia cores in October, probably in the wild at CES. Smartphone, watch, PC, IOT, etc. Data center after that. I expect it will bring Qualcomm much closer to Apple on the CPU part of the SoC. So yes, Windows PCs that can get closer to MacBooks in battery life and CPU performance. Linux at your own risk probably, because they have had a deal with Microsoft on this for a while.