As far as the sensor is concerned, Canon have yet to "catch up" to the D7000, let alone its replacement. I doubt they will, because crop sensor performance hasn't been a priority for Canon for a long time, if ever. But their crop camera body performance overall, has been ok, other than the Rebel series and the 60D.
But frankly, I don't see a new Sony-designed crop sensor having 14 stops of dynamic range...and even if it did, it would fall off quickly above ISO 800 or so.
That's the real difference though, Nikon has to have someone else design and build their sensors. Canon does their own. I admire that. But the current Canon sensor was designed in what, 2007? 2008? The 7D came out in Fall 2009, so certainly the sensor was designed many months before that. It's very, very old technology now.
The D5200 sensor has 13.9 stops of DR, and it is a NIKON-designed sensor, manufactured by Toshiba. I love this move for Nikon, as they're now seemingly in charge of their own sensor development and not tied down to any specific fab, as Canon is.
Keep in mind, people have been complaining about banding noise in the 5200 when shadows are lifted by around 2 stops. I have not seen any super serious example of it so far, but the D5200 sensor does not seem to really fare any better than Canon sensors (which can usually only withstand about 2 stops shadow lifting). The numerous mentions of banding in the 5200, and the mentions about how similar it is to Canon 5D II banding, make me wonder even more about the objectivity of DXO.
I also encourage anyone who disputes that DXO is truly neutral to download DXO Optics Pro and test it out on Canon raw files. Of all the available CR2 RAW editors, DXO Optics Pro seems to fare the worst, by far...especially in the noise and NR department. (Lightroom performs significantly better with CR2 files and NR, as does DPP, obviously.) The poor performance of DXO Optics Pro with CR2 files makes me wonder whether DXO really knows how to process them correctly, and whether that may somehow factor into the growing rift between anything Nikon and anything Canon in their tests.