Yup, ES4 with wide bore and ifi iem buddy combo is more coherent, larger stage and way more proper tuning than the nasal ZS10. ES4 is on borderline of roll off and boosted but not neutral. This makes it more extended and sparkly while bass digs deeper than ZS10. Mids are more upfront and instrument have proper space.
Did neutraliser eq on both and found that ES4 blends and smoothen instrument while retaining detailing(coherent) but ZS10 instrument sound separated and weird as violin and trumpets even after eq are a little brittle and decayish plus are still in front(not that much, but yeah) making its space to be weird. It does better job in songs with 1 or 2 instruments and vocalist, but complex track gets a weird stage(weird placement).
I listened them to Benchmark media DAC3 HGC with low gain