I would say the W5K and AD2K are both very synergy dependent. Both can sound bright and peaky with the majority of setups. Okay, the W5K is even more problematic. And then, as mentioned, you have the whole W5K fit issue.
From owning the W5K, borrowing the AD2K a couple times, and hearing them both on several setups at meets, I've never heard the W5K approach the AD2K at its best. And at its best, *cough* reel to reel *cough* Balancing Act, it can compete with the best cans out there.