I came across this video
in a search to learn more about focus peaking on the NEX-7. The commentary may not be in English but the menus are. Best viewed at the highest resolution IMHO.
I couldn't help remembering how much I used to enjoy Gordon's video demonstrations while I was watching this one but it did serve as a good indication of how focus peaking can help.
Has the Luminous Landscape's "rolling review" of the NEX-7 been mentioned? If so then it is about to be mentioned again. You can read it here