Take a look at the high ISO test between Nikon D4s and Sony Alpha 7. The Nikon D4s features 16.2MP FX-Format CMOS Sensor and Sony Alpha A7 features 24.3MP Full Frame Exmor CMOS Sensor, the Top ISO range of Nikon D4s is ISO 409600 and the Top ISO range of Sony Alpha 7 is limited to 50-25600.
We look at the High ISO images Nikon D4s is performing very well during High ISO test, the A7 image is downsampled to match with D4s resolution, but the D4s image is teck-sharp and have very less noise. Nikon D4s is a clear winner
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