that's a hard question to answer. Now days I just enjoy the music and really don't go into deep analysis. Overall they both are very full body sounding and I just love it. I think the Z5 is more layered, mids/vocals are more in front of you instead of in your head like the 846. I really can't tell which bass is better ... both can go deep as I find necessary. With my C5d bass boost on .. both can have a vibrating sub woofer effect in movies that goes through your body. Maybe the Z5 overall is more balanced as I find the vocals only very slightly in front but balance is just really good and very 3d. The 846 is more vocal focused but very dreamy. treble wise, I used the white filter on the 846 and I find the treble perfectly fine but the Z5 has a bit more shimmer I think. Overall, I think the Z5 is more impressive but only by a small margin. Alot of people I let people listen to the 846 and they find it quite ordinary but after you find those songs that make them special, you will know they are very special as well. I haven't found anything that sounded bad on the Z5.