Comments from The Purple Store:
Here's a bit explaining Santoku knives, thanks to Wikipedia:

The Santoku hōchō or Bunka hōchō is a general-purpose kitchen knife originating in Japan. Its blade is typically between 5 and 8 inches (13 and 20 cm) long, and has a flat edge and a sheepsfoot blade that curves in an angle approaching 60 degrees at the point. The top of the santoku's handle is in line with the top of the blade. The word santoku loosely translates as 'three virtues' or 'three uses', a reference to the three cutting tasks the knife performs well: slicing; dicing; and mincing. The santoku's blade and handle are designed to work in harmony by matching the blade's width/weight to the weight of blade tang and handle, and the original Japanese santoku is considered a well-balanced knife.

Santoku blade geometry incorporates the "Sheep's foot" tip. A sheep's foot design essentially draws the spine ("backstrap") down to the front, with very little clearance above the horizontal cutting plane when the blade is resting naturally from heel to forward cutting edge. Providing a more linear cutting edge, the Santoku has limited "rocking" travel (in comparison to a German/Western-style Chef's knife). The Santoku may be used in a rocking motion, however, very little cutting edge makes contact with the surface due to the extreme radius of the tip and very little "tip travel" occurs due to the short cantilever span from contact landing to tip. An example of this limitation can be demonstrated in dicing an onion - a Western knife generally slices downward and then rocks the tip forward to complete a cut; the santoku relies more on a single downward cut, and even landing from heel to tip, thus using less of a rocking motion than Western style cutlery.