I just added a Canon 5D Mark II camera with 24-105 mm lens to my equipment list. The full frame image, with noise free high ISO shooting will make it possible to deliver high quality available light photos at conferences and trade shows. The 24-105 lens has a maximum aperture of 1:4, but image stabilization makes it compete well with 1:4 lenses. And the 24-105 lens is sharper than my old 50 mm f1.4 lens. When this camera will be used with my 70-200 mm 1:2.8 lens it will absolutely rock.
This photo of a Toronto TTC streetcar at Danforth and Main at night was taken at f4 1/30 second at ISO 1600. Amazing clarity, even through the car windshield. More at flickr
Low light shooting was one reason to add this camera. Amazing low-light 1080p HD video capture is the second reason. Look for a demo here, soon.