I attempted a re-rest and failed miserably. Not only did I get the white balance wrong on the A99 shots, I couldn’t get the A77 to cooperate as I tried the same prime lens at different distances. I did learn a couple of things… Mirror lockup mode on the A900 is the bomb, the A900 has a ton of mirror slap evident with SteadyShot off. And if you copy crop settings from the A99 to the A900 in Lightroom, it adjusts for the additional size of the shot (6000×4000 vs. 6048×4032)
I did get a couple of interesting comparisons, so not all is gone.
Above is ISO 6400 on the A900, upper left, and A99 on the upper right. Below is ISO 12800 and 25600 respectively on the A99. These were all shot using the 85mm f/1.4 ZA lens stopped down to f/5.6.
Here is another interesting comparison.
Left to right, ISO 1600 on the A99, ISO 1600 on the A900, ISO 3200 on the A99.
I have to cut it short today… More later.