"The ALEXA had more range and produced a cleaner key in all conditions" says Seamus McGarvey, ASC, BSC. Because of the high number of both interior and exterior visual effects shots, McGarvey undertook extensive testing. "We were going to shoot sometimes on a very large scale in situations where I couldn't control the ambient spill of daylight," he says. "I would have greenscreen lit with hard sun and shade at the same time, within the same shot. One of the first tests I did was to see the tolerance of various camera systems in terms of latitude and ability to extract a key from blue and greenscreen in those ambient lighting conditions. The ALEXA had more range and produced a cleaner key in all conditions." via arri.com

It's one bad-a%$ camera!