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They probably sound more clear to you simply because they have more treble and less bass, which is valid of course, but it doesn't mean they actually have more clarity, it is just a different sound signature. I wouldn't want any more treble than the M50 has.
True that the M50s are very warm cans.
Unfortunately, the HD668Bs are noticeably clearer in the mid-range. In the upper frequencies, both do have the same amount of detail retrieval. WHICH IS DISAPPOINTING considering that the M50s are $150...
Treble-wise, the HD668B sharper yes, but it's justifiable since the M50s highs are very warm to begin with. Therefore, the HD668B aren't as harsh as you might think