I'm now listening to my Stax SRS-2050II System, and it is better than either the HD650 and K501 out of the WA6.
For at least a year, I was very happy with my SR-202 as the only headphone (besides the PX100 and KSC-35 directly out of my laptop) I cared to listen to. What made me consider dynamic headphones again was the announcement of the HD800. Thinking it would be among the best headphones ever made, I decided to pre-order it. However, I got tired of waiting, got wary of spending so much for a single headphone, and realized that my Total AirHead was too low-end, so I canceled the HD800.
Too late, though; I had caught the headphone bug. So I did a little research and ordered a Denon AH-D7000. The D7000 impressed me so much, initially, that I gave up on the SR-202. However, I eventually realized that I found the sound signature to be too v-shaped and the mids too thin (as in lacking body) to justify the price, so I sent it back and got a HD650. After having the HD650 for a little while, I found it to be pretty damn good, so I decided to "realize some of its potential" and buy a WA6. However, I missed the bass and impact of the D7000, so I (foolishly) bought the DT770 Pro 80 ohm, didn't like it, and (foolishly, once again) immediately bought the HFI-780, which is better than the DT770 Pro but crap compared to the D7000 (the HFI-780 has thumpy bass that cannot compare in any way to the D7000's tight, impactful, powerful bass).
Well, fast forward a couple of weeks to today, and after finding myself pretty disappointed in how the HD650 sounds through the WA6 (if anything, it is too thick - too much congestion in any track that has a lot of [upper?] bass), I just now decided to try my SR-202 (I barely listened to it the past two and a half months, and didn't give it a chance due to wanting to like my new headphones). Surprise, surprise, it is as awesome as I remember it being before I went down this newest path. So clear, so natural, so real-sounding, and all this with no congestion.
So, around three months and $1300 later (not including the D7000), I realize, once again, that my SR-202 is better than any dynamic headphone I've heard. I thought that perhaps the WA6 would change my mind on that. The D7000 was something unique, though - if I were to give up all dynamic headphones to keep just one at this point, it would be for the D7000, since it offers something an electrostat most likely cannot (powerful, impactful, head-shaking, yet very textured and refined, bass).
But I'm probably being too quick to judge the WA6. Hopefully it will improve over the next ninety-something hours (100 hours recommended burn-in time). If it doesn't, it would be very smart of me to sell off all of my dynamic headphones costing >$100, my Total AirHead, and the WA6, and to get an Omega II system sometime in the future. I'm not sure I want to give away my identity on this site, though (through PayPal). I've acted the jerky way I have sometimes due to anonymity. I might use eBay, instead.
If I were supporting myself, I would be much smarter with my money. I'm not in financial trouble, but spending $1300+, without much thought, on headphones and an amp over the course of four months is just stupid.
I'm probably going to be spending over $3000 on a headphone and amp (Omega II), eventually, though, so... But it will be the endgame, not a wild goose chase.