This image was rendered with POV-Ray 3.5. Many variables need consideration in order to produce this (nearly) photorealistic image. WinOSi on the other hand, uses a physically more accurate rendering engine, making it far easier to setup light in scenes, but at the cost of rendering speed. When comparing the two images, WinOSi reveals to handle the photorealistic details better as well. Rendering time for this POV-Ray image was roughly 20 minutes on 1.4 GHz AMD. (Scene tweaked by Hbasm)
I am very curious what other global illumination renderers are doing with this test case. I would be very pleased if someone could render it with Mental Ray, Brazil, etc. and send me the results. Visit the Download Section and get the scene file in various formats for importing it into your favourite renderer.
Another comparison with this test scene can be found at www.buildart.com/render_comparison.htm.
Currently it shows renderings of Truespace, Bryce, Art*lantis and Archicad with AV-Works.