Agree with your views that C435 is overall neutral sounding. Managed to audition both C435 and MH335DW last week. For the MH335DW, I find the bass too emphasised, so much so that it bled somewhat into the mids. Took it off within 15 mins of auditioning. I'm someone who likes bass, and one of my requirements for both headphones and IEMs is that they have to have good quantity of bass and not sound overly lean/thin. Even so, I still find MH335DW's bass too much for me. But for folks who likes lots and lots of bass, this is definitely the Fitear to go for.
The C435, on the other hand, is WOW! The clarity, the treble extension, the soundstage, are just so sublime. I actually don't find the C435 lean nor analytical - this coming from someone like me who likes bass. Rather, I find its bass tight, fast, and present with the right amount when the music calls for it. Stood there for almost an hour auditioning just this piece of gem. In my mind, I know that I have got to get hold of this baby some time down the road……Damn the price……..