At the risk of sounding like a flowery hifi magazine reviewer, Clears are just really, really good headphones, while Utopia sounds like it has some magical special sauce going on with how "3D" it sounds with its imaging. Not big enough difference to justify the price difference for me, but still, the difference is immediately obvious.

I had both for a while and for me the Utopia still amazes me whenever I listen to it. If I had to say, the difference between the clear and utopia is bigger than the difference between 6xx and clear. That being said, the clear was fantastic and I would’ve been satisfied with it had I not got curious and tried TOTL headphones