Resolution is not everything. (And IMO the HD650 is not more resolving than the 2C driven by proper DAC and amp.) I prefer the 2C to many higher resolving cans. Bass, smoothness, easy-listening, musicality are the strengths of the 2C. For long term listening these are the qualities I look for in a headphone. I know, there are more resolving and technically more capable headphones out there, I heard/owned some of them. But often at the end of the day I just want something relaxing and fun and not a technically perfect machine. The 2C delivers fun and bass like not many other headphones.The scailing aspect is something people don’t seem to gdt with the HD650. The 2C is a great headphone for subasd but overall resolution from the HD650, Atticus and Aeolus is superior to the 2C on most gear I’ve tried them with.
I think, by now you have made it clear that the HD650s are your absolute, all time favourite headphones and you were also often referring to the high-end gear you use with them. Would you mind to share with us at this point, what amp and DAC you use with your HD650s that make them the best headphones in the world? Apologies for the slight hint of sarcasm here, I am honestly interested.