Totally agree. It does not feel like a 600g + headphone on my head. I have not experienced any discomfort or fatigue
Most sources say 600-something, so I am not surprised to hear 630 and 638g. I think there was one site erroneously listing it at 460g. They must have copied the mistake into ounces, or vice-versa.
The reason I was asking is because in another thread we were establishing that the MX4 is indeed a lighter headphone. Mine weighs 568g. The point was that the MX4 is very comfortable, whereas the LCD-2CB I used to own weighed in at 644g and was starting to hurt after 45-60 min. It sounds like the 4z is close to the 2CB in weight, but more ergonomic? Why would that be? The carbon fiber in the headband instead of the metal?