Yeah, probably 8~10% or so better ST on average.True, we'll most likely see 20-30% extra MT performance. I doubt we'll see much in terms of ST (single digits).
But since AMD announced that Zen4 will come sooner than expected, it might be wise to wait a bit more (unless people absolutely need a PC right now, which can happen). Maybe intel will be forced to lower prices too
I have my doubts if Zen 4 is going to be that good. Even a 30% ST increase over Zen 3 would put it only slightly ahead of a Raptor Lake with a ~5% ST increase over Alder Lake. The biggest issue is probably going to be in the multi-core side, AMD would need to drop the core counts by one "tier" as they would absolutely need a 8 core CPU to compete against a 6p+4e core CPU, and even then, it would probably lose by a lot to a possible 6p+8e core CPU.
Platform prices might also be a negative for Zen 4, as DDR5 + new motherboards are probably going to be a more expensive.
But I hope it manages to be competitive all around against Raptor Lake, nothing better than having good options from both Intel and AMD.