But the demos of Unity are not that demanding. The bootcamp and the island demo are using quite small textures, only a few lights and moderate shaders. But they both show some bigger scenery. The bootcamp demo even uses the new technology from Unity 3 for a smooth transition between realtime lighting and lightmapping. So everything that is a few meters away does not use real-time lighting anymore. Leadwerks does not do anything like that, everything is realtime.
The bootcamp demo also uses the new occlusion culling in several areas and the terrain has no normal maps at all.