I have the s3, I had the s2 mhl and I know they changed the pin layout for the s3. This the s4 use the same mhl connection as the s3 or did they change again?
Since the S4 is a slightly different successor to the SGSIII, I'm pretty sure that the MHL Pin layout for the SGS4 should be the same 11-Pin MHL adaptor layout. Nonetheless, this may change when an official MHL adaptor comes out for said device.