We called the RS7 “Quattro's best work yet,” in a recent comparison test, which it won. The car is now even better. For 2016, the Audi RS7 sees subtle upgrades inside and out, much like those that apply to its stablemates, the A7 and the S7. The RS7 already was the freshest of the trio, having arrived here for 2014, so these changes are even less obvious.

Outside, it gets new head- and taillights similar to those that grace its less powerful siblings. But the style of the front bumper and lower air intakes remains almost identical to the pre-face-lift models (which should please current owners). With its large 20- or 21-inch wheels and matte-aluminum décor, the RS7 is the most impressive and perhaps the most harmonious in the lineup. Neither garish nor over-the-top, it does look imposing. With its new headlight contour, it reminds us of the original Audi Sportback concept that preceded the A7 on the show circuit.

Inside, the RS7 gets revised instrumentation with a larger driver-information display (now with Google Earth) between the tachometer and speedometer. An improved electronics architecture helps upgrade the graphics and the integration of the infotainment and telematics systems, now using LTE...