To totally pixel-peep head over to the original article – there are also links to comparisons with Canon and Nikon's top cams, but for a quick summary for those trying to decide which of these new full frame cams to buy, the answer is the usual “it depends.”
We are really lucky to be shooting images in a time when scores of really capable cameras are constantly hitting the market.
Sony Alpha A7r vs Alpha A7 Noise Comparison test
From Gordon Laing of Camera Labs:
To compare noise levels under real-life conditions, I shot this scene with the Sony Alpha A7r and Alpha A7, within a few moments of each other using their RAW+JPEG settings at each of their ISO sensitivity settings; my RAW results will follow once support is available in ACR.
Both cameras were fitted in turn with the same Zeiss 35mm f2.8 lens, set to f8 in Aperture Priority mode. DRO was disabled as it can introduce noise. The White Balance was set manually.
My first noise comparison is between the Sony Alpha A7r and it's more affordable counterpart, the A7. I fitted each camera in turn with the same Zeiss 35mm f2.8 lens set to f8 in Aperture Priority mode, so what you're looking at below is a direct comparison between their sensors and image processing strategies. As a reminder the A7r has a higher resolution 36 Megapixel sensor without an optical low pass filter, whereas the A7 has a lower resolution 24 Megapixel sensor with an optical low pass filter; the A7 also has phase-detect AF points embedded in the sensor which the camera must interpolate around to generate an uninterrupted image.
For Full story, check out Sony Alpha A7r vs Alpha A7 Noise
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(cover photo credit: snap from Camera Labs)