Decent IPC increase, but really good liquid cooling is required in order to get it. Prebuilts like Dell will likely use tiny coolers that will limit the performance of these parts.

Apple's M1 illustrates how far behind Intel is in everything, and AMD's upcoming Zen 4 is supposed to have a staggering 20% increase in IPC.

It is a good thing Intel has massive market inertia, because the next few years are going to be rough for them from a tech standpoint.