So got a chance to put the Mk2 through its paces.
As I've said before, coming from the e07k, I feel like the overall bass came forward, that's what I noticed the most. This is good because I felt like it was recessed with the e07k. The sound out of the Mk2 is mostly neutral/balanced. In my ears, it leans a tad to the bright side. To me, this is a good and bad thing. The good is that the highs sound better (I can tell more detail), which is fantastic because I felt like this was the se846's weakest point. But the bad is that female vocals sound too forward. Evanescence is an example where this is unfavorable, because I want to hear the band just as well too. It's not huge deal, it's just enough for me to tell. Bear in mind though that I am pretty sensitive to higher frequencies.
One thing I do like in my sound signature is sub-bass. This is what made me choose the se846, because of the "true subwoofer" feature. While the Mk2 brought in the overall bass, I felt like I was still missing enough sub-bass to make me satisfied. Fortunately, I looking around the sound settings of the Mk2 on my PC, I noticed a "bass boost" option. I was mixed about touching it, because I just wanted more sub-bass, not overall bass. There was plenty of punchy mid-bass already, I didn't want more of that. But! I found that it gives you control of what frequency to boost. This is freakin fantastic. I up'ed the 50Hz frequency a few dB and boom (literally), I got what I needed. So I'm a happy camper now.
To sum up, I am pretty satisfied with my purchase. Everything sounds great, feel like I got my moneys worth most definitely. The gripe I discussed above is only a minor one, and might only be a gripe to ears like mine.