Grimm - Dragon Morph from Jerod Bogh on Vimeo.
To this day it's one of my favorite stills to see the raw progression I've made in my understanding of ZBrush.
And the progression in that still in particular is very much due to Paul's awesome book. Check it out you won't be sorry.
I think the Zbrush shading system is very versatile, much more than I previously thought, but it most definitely has room to grow and improve as well.