Originally posted by Ayoh there are a number of documented test reports of poor AF accuracy of the d800/d4 with f/1.4 lenses on digilloyd.com.
The D800 has its famous accuracy problem with its edge AF sensors, that's true. But it should do fine with its center AF points. Any diverging opinion in
http://diglloyd.com/prem/prot/ZF/publish/135APOSonnar-examples-portraits.html ? (I haven't subscribed yet).
Also, the tungsten problem with my D800E is nowhere near as obvious as with the K-5 in low tungsten light. I only care about at very wide apertures (which I don't normally use in the studio) by using a small extra AF fine tune, something which wouldn't have been possible with the K-5 (out of range, luminance-dependent). I use Reikan FoCal to determine these color-temperature dependent values quickly (they differ, but not by that much ...).
The K-5II AF is great, from what I hear. But this now holds true for most competing cameras, esp. a few mirrorless ones. The big area which still does make a huge difference is to focus on fast moving subjects. That's the point of phase detect.
That's the remaining market for a hypothetical K-3 too, assuming it to be more expensive than a K-5II.
High fps, large buffer, locking on fast moving targets, incl. when using the DA 560. An upgrade for those D300s or 7D owners waiting for an upgrade which doesn't emerge from Canikon