With the stock tips I can see that comparison. I think the Superior EX does sound a bit cleaner overall but less technical. But then again the DD handles the bass very differently than the BA config of the 335DW.The normal SUPERIOR has a qdc-like sound with clean highs (some songs sting), whereas the EX has more mid and low frequency resonance than the normal, with rounded highs. Japanese fans say" it sounds like the MH335DW" and I agree.
Interestingly the completely unrelated MH335DW EX also just released!