Phil Holland (who gave us some very handy RED crop factor and data rate sheets) shot the following tests on his Al Canon-mount RED SCARLET. Graded in REDCINE-X Pro and edited in Adobe Premiere Pro CS5.5, the tests include low light and 3K/48FPS tests. If you have a high-resolution monitor, you can even view them in 4K resolution (select "Original" if you've got the screen real estate):
Mostly on the Tokina 11-16mm f/2.8, but also in the video are the Canon 24mm f/1.4L, 35mm f/14L, 50mm f/1.2L and 85mm f/1.2L.
This test material was shot in 4k at ISO 320-6400. Lens apertures were f/1.2-f/2.8.
Lenses used here include the Canon 50mm f/1.2L and 135mm f/2L. Also used are the Tokina 11-16mm f/2.8, Leica Summicron-R 90mm f/2, Voigtlander 40mm f/2 Ultron SL II, and a modified Canon 55mm f/1.2 FL lens.
This test material was shot in 3k at 48fps.
Mostly shot on the Canon 24-70mm f/2.8L at between f/2.8 and f/5.6. Other lenses used are the Canon 35mm f/1.4L, 85mm f/1.2L, and Sigma 300mm f/2.8 with a 2X Teleconverter for the sunset shot.