Got the es4 now since I was happy with the zs3, Holy bass difference. Sound also narrower and warmer, but do not have the great fit as the zs3. For me personally the es4 is for bass moods, and the zs3 I think is better for longer sessions and background music. Positiv that there was such a difference between these Earbuds. Also ordered the trn v20 since I got out at 10 USD and can use my Bluetooth cables with it, any idea hope that compares to the zs3 and ES4?