A 24mm lens for test is hardly the most challenging scenario, and its performance at the longer focal lengths is where it matters most. In particular, shall have to keep an eye open as to how it performs with USM vs. STM lenses.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
D800 live view problem sounds as if the live view would work okay, but problems appear in several serial numbers. I would not call it an issue or a problem (as a failure), I would call it simply bad engineering at worst. It is not specific to D800, other Nikon models also have poor LV capabilities. They fixed parts of it in the newer models. Manual focus with D810 (and maybe a loupe) is great, but the trouble is, it can be set up to show DoF and that makes it impossible to focus in low light and closed aperture. As far as I'm concerned, I could not discover a logical concept to set upt the LV the one or other way, everything appears to be hidden in a marathon menu.
Don't understand, why they don't use bright view and couple the DoF control with the button like when using the OVF. But maybe I haven't figured out how to do so. Of course, if LV has to amplifiy to the max, noise becomes a problem. Haven't used other cameras working fine under these conditions.
The D800 magnification problem in live view is specific for the D800. It got fixed by Nikon through introducing the D810.
There is no "serial number" related issue, it is the same for all D800's.
I tried my friend's A7RII today for about an hour with three lenses (FE 35/1.4ZA, FE 55/1.8ZA, FE 90/2.8G).
The viewfinder is larger than A7R. AF is much faster and without hunting, kinda feels like the AF of an SLR. Shutter is much quieter in normal mode or electronic first curtain mode, and of course silent in full electronic mode. The shutter button is much better located now.
The only downside is that the body kinda feels "cheap": the battery door, the usb door, the wheels, and even the hinge of the screen all feel very flimsy, very odd for such an expensive camera, especially since these parts were fine in the A7R.