Very useful information there : http://www.tomshardware.com/reviews/sdxc-sdhc-uhs-i,2940.html
For future NEX-5-7 user ... I think the Kingston is the best way to go ... Instead you like to wait for the "writing" message when you can to film after a burst of picture ... But keep in mind that they have not tested everything available on the market (but I think this card are more common on most of the store).
There is also the chart updated for almost all the card they tested: http://www.tomshardware.com/charts/external-storage,39.html