I do own the carbons and have sold my meze classics. Both are great. The meze has more treble and also more bass quantity. The carbons have better soundstage, imaging, detail and slam. R&b and hip hop are good on both. For rock i would give the meze a try, because the meze has a little bit more mid presence. But overall the nighthawk is superior in terms of sound quality.
The biggest question is: How will you use them? If you are using them with your phone and for portabel use, i would recommend the meze, because it is closed back and doesn’t leak sound.
The thing about the hawks is they started out as a $700 headphone that got discontinued and now can be had under $300. The Meze was released as a $300 headphone. The hawks will be a higher tier headphone in the sound, build, and accessories department. I haven’t tried the Meze, but I will always be partial to the hawks because they opened the door to higher tier headphones for me.
I ended up finding a pair of 99 Classics on eBay for £150 so picked those up. The Audioquest’s were my preferred option really but at £95 cheaper for the Classics, I thought it was a good enough deal to grab those for now. Will mainly be running them off my iPhone too, although might grab an ES100 at some point.
Not saying I won’t pick up Audioquest’s at some point though