So remember how the Reference One I posted earlier bested all of my other headphones?
The Pro/4AAA is a better version of the R1. It has more treble, more detail, and the mids are clearer. It feels like a veil has been lifted off of the sound. The soundstage is still huge and the imaging is great, but they're much more compact and stylish than the R1s. Surprisingly though, the 4AAA appears to weigh slightly more, coming in at 520 grams compared to 506 grams for the R1s. Sadly they don't isolate quite as well as the R1s, but I doubt any headphone ever will. Another thing to note is that the cable is longer, heavier, thinner, and more flexible than the R1's, which is actually bad because this leads to a cable that's too long and is tangle-prone. Because of this, I'm considering swapping them out. Might not though, because the 4AAA's termination is nicer.
Either way its a great headphone and I'm glad I bought it. Sadly I forgot my camera at home so I can't take a picture with proper lighting yet.