sfisher has it right. I don't know what more we can say -- ISO not something that cameras can "be better at". They can be better at keeping noise down at various ISOs, but ISO is defined as a specific amount of light sensitivity under specific lighting, aperture, and shutter conditions. Cameras are designed so that ISO 100 is exactly the same as on any other camera, so that when you pick up a different camera, you know exactly how it will work. That's why it's called a standard.
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