Nikon's flagship APS-C line got a long-awaited update in the D500. And as far as updates go, it's an impressive one: its 20.9MP sensor, 10 fps continuous shooting, 153-point AF system and 4K video shooting make it something of a DX-format D5. Our initial studio test results have been very encouraging, so we were eager to follow them up with plenty of real-world shooting.