Yeah, in retrospect even something as hefty as the SP1000 wasn't the greatest choice but I at least wanted to get some albeit short impressions on the MX4.
I weighed them without the cable which I believe is close to the official Audeze weight.
The Ether Flow is my personal at home headphone and I would say the MX4 is a warmer sound in comparison but not really overly so in my opinion. Soundstage was rather similar in memory, possibly I would say the MX4 is a wider. The MX4 is without an easier headphone to drive than the EF, on some of my smaller DAPs I have round the office the MX4 gets pretty loud pretty fast and the EF I think something beefy like an AK Kann drives it quite well.
Sound signature sounds perfect then! Thanks for the added comparison. Still a bit confused about Audeze's 30% claim though doesn't seem to add up... Ah well if they are comfortable when I demo them next week I guess the actual weight doesn't really matter!