wow really nice image there digitaldecoy !
yup surely the subdi levels approach ZB and MB have is great for sculpting organics.it allows to exploit machine power and ram at the right moment, plus, since it subdivides and smooths, allows for a more precise way of sculpting organic shapes and features. you can also go up or down to your hearth content, make changes (for example on proportions) and return back t your detailed mesh.
this being said, i see 3Dcoat toolset is proceeding quite well. to be an alpha toolset it seems that things are improving fast. maybe volumetric sculpting will be more suited to do more precise -greeble stuff like digitaldecoy made or also more mechanical or bio-mechanical stuff too. (btw this stuff is doable in ZB also, but it is more complex)
It will be very interesting to see how VS will be once released in version 3.0 and from what i see in the forums it has still something like 50% of power to unleash !
i think 3d coat will be a great complement for Zbrush and traditional 3d apps indeed.