If you'll notice, Intel is using thermal velocity boost (TVB) to achieve those speeds. By default, the top-end Comet Lake-S chips will only hit speeds like that when TVB allows, which is going to be based on a different boost map than what they normally use for 14nm chips. The jury's still out on how often that will show up outside of ST benchmarks. My guess is that for any workload with 2-3 or more heavy threads, TVB won't be a factor at all. The jury's still out on whether it can boost any higher on even lightly-MT workloads than CoffeeLake-S configured for the same TDP.
What you're going to see are just higher TDPs.
I'm not convinced we'll even see it in benchmarks.
(Sorry, I'm on mobile so it's easier to just link my own Tweet here)
This is a 10875H laptop running R15. In other words; an SSE workload. AVX was only introduced in R20. This isn't even the max piwer a single core can draw.
34W on a single core... for 4.9GHz. This laptop in question couldn't hit EITHER degree of TVB on CML-H - not the 65 degrees threshold, nor the 85 degrees one.
You won't ever see that 5.3GHz on a laptop. Maybe on desktop if you've got a monstrous cooling setup, but never on laptop.
Not that that's stopping OEMs from being nuts on these laptops.