Unfortunately, I never got around in buying the ZS6, since the majority of owners had placed the ZS6 as sibilant and spikey (at around 10kz, maybe?). But, after buying the KZ ZS5 (v1), I never gave the ZS6 some thought in getting one. But, since I do own both the ZS5 and ED16, the ED16 just outperforms them with much better coherency and transparency, but resolution is about the same. My personal experience with the ED16 is that it basically doesn't need any MOD at all for what it's worth. To my ears, there is no sibilant or harshness, whatsoever. They are just brilliant and balanced from end to end!