I did a benchmark IBD a long time ago. It's about 5% for assumevalid 0. It's massive for certain forms of massive. 😆
The fact that everything else is twice as fast will probably have a decent impact as well.
And it seems they upgraded the power systems quite a bit, which was causing a lot of trouble on Pi 4 with dodgy power supplies.
So, even though it not perfect due to closed binaries, it looks like a really nice upgrade on paper.
https://github.com/bitcoin/bitcoin/pull/24115#issuecomment-1026969684