So the camera on the S6 is pretty good.
Out of interest, how were you using the DSLR? Auto or some other semi-manual control (P, Av, Tv), format (Jpeg, RAW), other settings (picture styles, noise reduction, etc.)
Even a low end Canon DSLR with kit lens should take noticeably better shots than the very best camera phone available if set-up and used correctly 😉