As a matter of fact, I do. Both are about as V-shaped, but the M6 Pro has tighter bass, thinner mids, and a brighter treble. S5 has more impact and more energy, and doesn't really have that hot of a treble thanks to the bass. IMO I'd take the S5 over the M6 PRO.
Me too, S5 sounds slightly more detailed too to me. And build quality of S5 can give competition to MA750.