Although pipeline was primarily developed for characters, you may bring practically any scene from iClone into Blender with close to 100% accuracy in materials (no cameras or lights though).
That is by attaching the scene to any character, sending to CC and then to Blender with pipeline.
iClone render of a large scene

Same scene imported to Blender with a character. No changes other than enabled Courtyard lighting scheme in importer properties.
(Viewport eevee render)

BTW I have tried USD before from CC to Blender. No materials came through. It's probably optimized for specific Omniverse connector.
Maybe exporting the result from Omniverse would work though...