In this image:
-The Game Mesh at 8250 triangles.
-Rendered Game Mesh with 1k textures.
-And HiRes mesh at 39338 triangles with 2k textures and SSS skin shader.
Both are using Diffuse, Specular, and Normal maps.
Rendered with Mental Ray in XSI
Normal Maps built in Zbrush, with some xNormal elements.