No, I have not. I have seen many reviews though, on the C10. I'm curious about it, but I think I'd like to try the ZS7 first. I get your reference to the Sennheiser over ears in terms of differences, but I'm moving away from full size cans and find myself gravitating more to iems. Tbh, I like the Massdrop HD58X more than the 600's or the 6xx/650. To me though, none of these are my ideal sound signature though.