Yup, notice in this link:

http://users.htdconnect.com/~djcarlst/abx_data.htm

Look at the level difference test. A level difference of only 0.3dB was identified 76% of the time. 0.3dB!!! Make the very small increase to 0.4dB, and it was identified correctly 93% of the time!! This implies that the 1dB steps for level matching on most processors is inadequate.

So, very small changes quickly become VERY identifiable. That's the sensitivity where these tests are very good at validating true sonic differences.