The Shadow-Settings need some tweaking anyway. What's remarkable between all those renderers is, that they seem to handle the Shadow-Map sizes in different ways. For Example Mental Ray needed in my cases at least a Map Size of 1024 of acceptable Shadows, whereas Maya was statisfied with a 256er. Renderman is in between with 512 (Renderman was the fastest Renderer in the Test...even faster than Mental Ray who took all 5 CPU's for this image, but for Renderman i had to split the image from top, and render two threads for using both CPU's).

All RenderTimes all somewhere between 30 and 40 seconds. This Image isn't an ideal picture for Testing RenderEngines. It has no heavy models, heavy textures, or anything else..just a test