WiFi slower on late 2013 15" rMBP

So yesterday compared SpeedTest.net between my late 2013 15" rMBP and a mid 2012 15" MBP and the new machine is about 50% slower.  The WiFi is a Cisco Meraki AP's (2x).  Both machines were under two feet apart.
Then last night at home compared the new 15" against one of old 17" MBP's (2012??) and on fibre broadband with the latest Apple Airport Extreme base station and again the new machine was at least 50% slower, testing this time on testmy.net as recommended by an Apple Support engineer, after also flushing DNS as also recommended.  And at home, I was the only person on the WiFi at the time.
Have got a Genius Bar appointment later next week, but was just wondering if anybody else has noticed this?

I'm having the exact same issue. I own a Late 2008 MacBook Pro, Late 2011 MacBook Pro, and now the Late 2013 MacBook Pro and of the three only the Late 2013 MacBook Pro demonstrates the lack of WiFI performance. I've tried it with mutliple different wireless networks with Bluetooth turned on and turned off with no noteable difference in levels of performance.
From the quantity of posts I've seen from a simple Google Search, it appears the problem is fairly widespread and really points to an issue with either the WiFi antenna, interferance, or a combination of the two.
I'm planning on opening a Support Case with Apple and I would recommend others do the same in order to get more visibility on the issue.

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