Just bought myself a pair of the above earbuds and was expecting big things after reading lots of reviews. 
firstly the sound is excellent I have to say, but, and it’s a big but, the NC is totally ineffective from what I can hear. 
I have a pair of Bose qc20i and absolutely love them and the noise cancelling on them has worked brilliantly. I wanted the freedom of wire free so went for the Sony, and I honestly can’t tell if the NC is actually on or not when turning it in and off. 
can someone tell me that theirs are working really well and mine are faulty as it’s driving me mad here.