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Some unique highlights of Stylized Looks include :

Render in RenderMan .. Post Processed with Stylized Looks
Stylized Looks are a post-process that happens after your image is rendered, handled by 3 various PxrDisplayFilters (Toon / Lines / Hatching)
Create your scenes using all the powerful RenderMan toolkit, including PxrSurface, Lama, and the analytic RenderMan lights .. then transform to Stylized Looks!

Toon + Illustrative/Hatching Lighting + Lines

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Create incredible imagery by using RenderMan Lights to mix the transition between photoreal and stylized. 
For instance, use the beam from a spotlight to add hatching to a photoreal render.

Global and per-object control

Attach the PxrStylizedControl to your PxrSurface & LamaSurface nodes to control either your entire scene or per-object.

Control different line thicknesses / colouring for certain objects