I should have shared this a long time ago. I’ve been using a version of the Crytek Sponza Scene for testing the Unity GI. All the materials are setup with the standard shader. Unfortunately, I haven’t been able to get it to bake with Real-time GI or Static GI on RC3+ but I’ve gotten it to bake in the past and the results can be quite nice. There is a sun and an emmisive sky plane to test different lighting scenarios. The fbx needs to generate lightmap UVs so importing can take a few minutes.
https://www.dropbox.com/s/copdj3wj56oqe1h/Sponza.unitypackage?dl=0