Are there any real world tests on equally loaded set ups?
Yes. Most benchmarks favour windows 8.
They never bandied about beta names like "Chicago" and "Vienna" the way they ballyhooed "Metro." (The closest they got before that was "Longhorn," which only people who cared about Vista pre-release bothered with.) The reason they dropped "Metro" was because a minor lawsuit gave them a good excuse for escaping the fantastically terrible word-of-mouth it'd gotten - only it didn't work, and "Metro" stuck. Just a shame Metro the thing stuck with it... :/
dwup.inf from windows 8
[version]
signature="$CHICAGO$"
.....later on.....
;Profile for LocalService and NetworkService, moved from Users in Longhorn, creator specifies security
.....later on.....
;Profile for system account - moved from Docs and Settings in Whistler. Creator specifies security.
They are internal names & the only time they really used any of them publicly was in the beta test before the product name was decided.
I don't care about metro as I just don't use it. Which is good because I can't remember what I'm supposed to call it now.