They're similar, but I'd say the noise cancelation is a bit better on the sonys. I also prefer the tuning on the sonys, but that's a matter of taste. (I don't o

They're similar, but I'd say the noise cancelation is a bit better on the sonys. I also prefer the tuning on the sonys, but that's a matter of taste. (I don't own a pair of qc35, but I did swap with a friend for a plane ride). I don't know about the qc35, but on mx3s you can turn on/off the nc features, or cup your hand over the speakers to temporarily pause them. They also have a pretty good bluetooth low energy implementation which makes them last more than 14 hours, but I haven't ever let them fully run down so I don't know the true battery life.