There is certainly a noticeable difference in sound quality between the original black brown (over-ear) Momentum, and the new ivory (on-ear) model.
I found the mid-bass to be too pronounced and slightly bloated. Also I felt the resolution was slightly lacking, but only in comparison to the original.
At it's price-point, it's still OK. You can do better for sound for the money, but not necessarily combined with good looks and decent portability.
If you plan to take them out into very noisy environments, the ivory one might actually be better, as they have a bigger bass presentation, which is needed when surrounded by noise as our perception of bass is the first thing to disappear on a busy street or aeroplane.
Still thank you for your sharing. But I'm talking about the ivory over-ear one which is just shown in CES.