While I heard the two pairs of AD2000 vs my own AD1000PRM, where one is stock the other is recabled with cardas and have pad modded. My AD1000PRM have also been recabled by Audio Technica to the 4 core cable they meant to have.
Stock AD2000 vs AD1000PRM
Just like the review, the AD2000 is more weighty but the AD1000PRM have crisper treble and faster bass response. The comfort on the AD2000 is quite a bit worse than the PRM, the driver grilles touches my ears and pressed hard, where the AD1000PRM have far more space for my ears.
Modded AD2000 vs AD1000PRM
Now this is where it is very interesting, the modded pair have pretty much the same fit as my AD1000PRM, and the sound... VERY similar if not the same. The treble opens up and the bass responses gains the speed of the PRM.
As I heard them in a meet, I cannot comment much on the details and definition, but from my extended listen I do not find the AD2000 are more detailed, I found the stock one more forgiving than the PRM, but the modded one is a different matter, they sound too similar to make a comment. I suggest AD2000 users try out modding the pad, increasing the distance from your ear to the driver can change the sound quite a bit.
Many sources from Asia claims that they both uses the same driver, some says they are exactly the same, some says they uses different final coating. I cannot say they are the same, but they are very similar.