My ZEX Pro is came today and I am using it for 5 hours by now. Feels confortable for me, despite the stock cable - I don't like it.
At first, I disliked the soundstage and felt that the IEM is not airy, have no resolution, or details. My set have no peak at 8 khz, or I can't notice it. After EQ-ing the upper freqs (based on the graph of Crinnacle, to compensate the depressions) this IEM became somehow very enjoyable, energetic, euphonic, airy and... with much better resolution and larger soundstage than at first use. It seems that KZ had again nailed a very good item for the price.