Thanks for the comments.
These are my initial impressions for my UM6x. Please dont fault me if i use the wrong terms
The bass on my UM6x are much tighter right now. If you compare the original UM3x, the bass is quite flat. I'd say that the bass is somewhere between the W3 and UM3x. One thing I've noticed is that, if you listen to the UM6x at lower levels, the bass can get a tad bloated. But when you really listen on your personal listening level, it gets tighter.
The highs are faster and you really can hear the details of the cymbals crashing as the drumstick hits. I'd say that it's just about right. comparing the highs to the UM3x, it is slightly brighter. But because of the bass, I would think that it evens it out nicely.
The mids are more forward if you're listening to a rock, live or acoustic song. The vocals are really clear as compared to the UM3x. For an electronic song, the vocals are not as forward but I can live with it.
The soundstage is definitely wider and longer in depth. height wise, I think that it is relatively the same. At the moment, those are my impressions
Oh, my setup is SCSAG DIYMOD 5th Gen + SCSAG LOD with BG CAPS + iBasso D4
Cheers!