I also have a 2009 Dell Laptop 2.66Ghz Core 2 Duo with 8GB RAM running Windows 2010 that I just cleaned up to give my parents. None of the above is true.
You are also trying to compare a laptop an entirely different architecture that literally just came out to the other.
I mean, honestly, there were plenty of "arm laptops" the past 20 years and a lot of them ran cold to the touch and got 16+ hours of battery life. I know as I had several (Psion netbooks etc). The new Macs are latest evolution of H/PCs that have been around for decades. They just happen to be much faster ;)
On the other hand, you would be surprised how well Office365 runs on Windows 10 on my old Core2Duo 2.66Ghz Dell. It also has a beautiful 1920x1200 display before laptops went 16x9 and Gigabit Ethernet.
It was originally a company laptop for a failed startup I worked for and was to use to run Windows CE emulators while developing using .Net compact framework.
I've never seen people refer to processors by their ghz without giving a generation designation. I think stating what generation/model of c2d it is would be a far more effective means of communication that stating its ghz.
I had a dell studio with a t9660 that was a pretty good machine way back in the day. But you should refer to the cpu by its model number rather than by its ghz performance, since nobody will be able to identify it from that.