Dpreview analysis: New Sony a1 sensor offers class-leading dynamic range, along with high-speed and high-resolution

Preorders:
Sony A1 at BHphoto. Adorama. Amazon. Focuscamera.
Sony XPeria 5G PRO at BHphoto. Adorama. Amazon.
Sony A1 in Europe at FotoErhardt DE. Calumet DE. Fotokoch DE. Park UK. WexUK.
Join the Sony A1 Facebook group here.

Rishi Sanyal from Dpreview tested the Sony A1 sensor and writes:

The sensor in the Sony a1 displays a marked improvement over the first-generation full-frame stacked CMOS seen in the a9 and a9 II, with increases in resolution, readout speed and dynamic range. Up until now it had seemed as though fast sensor readout and high dynamic range were mutually exclusive. The a1 has the fastest sensor scan rate of any camera we’ve measured, to our knowledge only roughly 1ms or ~25% slower than a traditional mechanical shutter.
And yet despite the speedy readout and shooting rates, the a1’s base ISO dynamic range is class-leading compared its sport-oriented peers, and lies within our measurement error of its class-leading high-resolution full-frame peers. Meanwhile, high ISO dynamic range remains competitive, surpassing that of many of its high-resolution peers and falling only slightly behind lower resolution cameras that have less cumulative read noise due to fewer pixels.
That means you won’t have to worry about trading off any image quality for the capabilities the a1 bring that hinge upon its fast readout. High contrast scenes such as the one above, and more challenging ones, can be handled with ease if you expose to retain highlights and tone-map underexposed tones to be visible in post-processing. And the dual gain design of the sensor ensures low noise levels as light levels drop. The Alpha 1 should offer a great deal of flexibility regardless of your shooting scenario.