“ I have the D750 & D500 (I actually traded in my D4 for the D500), and agree with your observations. The D500 is superb, but it doesn't focus lock as fast as the D750 with the same lens. Now don't get me wrong, the D500 is plenty fast, but something in my gut tells me it's been deliberately nobbled just a tad. Did the D500 perform better than expected in development? ”