Sabretooth was my favorite villain from X-Men and on my list of characters I always wanted to make. The first thing I did was to collect as many references as I had time to and find a look I wanted to use. I plan to use this model in a Sabretooth vs. Wolverine scene when I get the time.
I always model in a T-pose to utilize the symmetry and so my models can be easily rigged. Modeling was started with a base mesh I already had from an older project. Before moving into ZBrush, I scaled my model to a realistic size in 3ds Max (Customize > Units Setup). If the scale isn't set to a real size, you will have problems with your SSS shader and other rendering settings.
I used ZBrush for sculpting the anatomy silhouette, using the Move and Move Topology brushes for the first few subdivisions. The muscles and leather folds/details were sculpted in the higher subdivisions, using the Clay Buildup, Dam Standard, Flatten and Move brushes. The Flatten brush was used in place of the Smooth brush to even out the surface. I find the Flatten brush gives more control and maintains more sculpted details.
TopoGun was used for retopology and then cleaned up in 3ds Max. I used the muscles as a guide for the edge flow on the body, so the mesh would deform correctly when the limbs were moving. Also this allowed the base mesh to capture more of the silhouette and form, resulting in less displacement (Fig.01).