I had a lengthy session comparing some heavy hitters in the closed-back space today. I included the AWAS, AWKT, and the WP900 in this 'shootout', of sorts.
In comparison with the WP900, the AWAS has a less pronounced "v". Bass has impact and slam, with good texture; however, it is not as prominent as the presentation of the lows on the WP900. I also found the treble on the WP900 to be coarser in texture. On the other hand, highs on the AWAS are clear, with great clarity. The midrange is a little scooped, but they aren't as recessed as the mids on the WP900. As a result, vocals sound a bit more forward - songs with female vocals are especially pleasant to listen to. The AWAS is great for Dance music, and some Pop and Rock, especially if your collection consists of a sizeable percentage of female-driven tracks.
With the AWKT, you're getting a generally balanced sound, with a slight focus on the upper mid-range and treble sections. Unlike the highs on the WP900 and the AWAS, the AWKT has a smoother treble presentation; they remain clear with a lot of micro-detail. Moreover, they are less prone to harsh peaks than the other 2 headphones. Bass is linear, with great extension into the sub-bass region. You'll get punchy lows, just very little of it. However, vocals are comparatively more distinct, with a slight tinge of lushness and body that are lacking in the AWAS, and especially the WP900. Essentially, the AWKT has a very natural sound, and fares well with myriad genres of music. However, it suffers a little with bass-heavy genres, such as EDM, as the relatively anemic bass region struggles to create a thumping bassline.
Imaging and staging on the AWKT and AWAS are rather similar; they both fare pretty well in this regard. Unfortunately, but not surprisingly, the WP900 has the smallest soundstage of the 3. The AWAS has a noticeably larger stage in 3 dimensions. The AWKT has an analogous soundstage to the AWAS, but it is a touch deeper. In all honesty, the WP900 sounds compressed in comparison to its brethren.
If you are interested in comfort, both the AWKT and AWAS felt somewhat cozy and snug on my ears. However, as I wasn't listening to each headphone for an extended period of time (I kept switching between all 3), I cannot tell if your ears will suffer from episodes of discomfort. However, the weight of the AWAS and AWKT are discernable; both weigh approximately 400g, so you'll definitely notice the bulk after long listening sessions.
One other interesting thing to note - the pads are very shallow. My ears were about a centimeter away from touching the grills. Interesting, if not weird, design choice.