In terms of noise cancelling, the QC2 appears to offer slightly better performance, both in terms of passive blocking (ie with the noise cancelling turned off - simply the reduction in sound by wearing the headphones) and active blocking (ie with the noise cancelling turned on).
The effectiveness of the QC3 to cancel noise - particularly passively - probably depends a bit on the size and shape of your ears. The chances are that some ears offer a better fit and seal than others, which might explain why there have been a wide range of reader comments about how well the QC3 headphones do (or, more notably, don't) work for them.
When listened to in a moderately quiet environment, the QC3 headphones have a similar low level of electronic hiss as do the QC2 headphones, and less than the Solitude or Plane Quiet headphones. But in a noisier environment, it is hard to hear any difference in hiss at all - the hiss is drowned out by the remaining noise that isn't cancelled out, and so this is not a very important issue if you're planning to use the headphones primarily in noisy places such as airplanes, rather than in comparatively quieter places (such as offices).
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