Mateo, The jaggies on the window shadow are because I was using a low resolution gel on the spot light. A higher res gel would fix that problem. You can also adjust shadow resolution and fuzziness to suit your subject. A cool new feature is the ability to adjust the "size" of the emission from a spot-light. It's called Light Radius. A small radius creates crisp shadows behind an object; a large radius creates crip shadows up close to object that diffuse and get soft the further away from the object the shadow gets. Andy, HDRI is as fast as the photorealistic render settings. BUT, it is pretty important to do test renders trying various settings at a smaller resolution before you go for the big one. It's easy to "over adjust" the settings beyond what is really needed for a given image. You can go from a 2 minute render to a 30 minute render simply by moving an adjustment slider a little too far. HDRI is GREAT! The image above was lit with only an HDRI background and one spotlight set at 15%. The ability to realistically create environmental lighting and beleivable, bright reflections is fantastic.