I don't have any meaningful input on processors. Other than a little home video editing I do very little CPU intensive stuff.
At work I have a quad I5 Laptop and it's pretty fast.
I also have a 12 core Xeon 3.2GHz desktop machine at work with 16GBs memory, pretty sure it's never been over 10% CPU. I'll try editing some video with it to see what happens. It has Outlook, Powerpoint, Excel, Word, OneNote, Project, Spotify, IE, and several other apps open right now and sitting around 2% CPU with spikes up to 7% running Win8.
Have a i5 laptop and i3 all in one at home, both seem about the same speed wise. The i3 has 6gb memory and the i5 has 4gbs.
Have a Surface RT which is AMD, but that's a different beast than what you are looking at.
Can you tell where I work at?
I don't remember what's in my other machines at home. They are older so not the current gen Intel or AMD chips.