Accidentally bought OMTP headphones for a CTIA phone, what now?
I think the OP has already bought a converter and is enjoying the MH1, but in case someone else stumbles upon this, I have Xperia Z2 and an old MH1. I use a Sony Ericsson EC250 adapter. Everything on the MH1, including the mic and all four buttons are working fine. The converter is basically a CTIA to OMTP converter for old phones, but those converters work in both directions. You don't specifically need the EC250. Any OMTP to CTIA or CTIA to OMTP converter should work.