Yes, and it doesn't always detect it. I'm using, with M8, the Dankowski set of settings, and I've gotten some really incredible results; It's a laser. What happens is that after 2 hours my listening fatigue is brutal.
With M15 I go exactly the opposite: on the quietest sensitivity setting, since with the M15 the depth is given by the physics of the coil itself.
Generally I always hunt on the beach, and with each coil, I know that I am looking for a different type of objective, so I adapt to it, the circumstances and the objective I am pursuing.