Cameramemoryspeed published their comparison/test results of different Sony and Lexar XQD memory cards with the Nikon D5 – the Lexar Professional 2933x XQD 2.0 was the best performer followed by the Sony G Series XQD:
“For the best performance, the Lexar Professional 2933x 64GB XQD 2.0 was the fastest XQD card tested in the D5. It averaged over 292.9 MB/s write speed during continuous shooting. The runner up was the Sony G Series 64GB XQD Card which averaged 273.9 MB/s write in the D5.”