How do you replace the yardstick? It’s no easy feat, but Cadillac thinks it has the answer. You see, when it comes to sporting luxury sedans and coupes, ze Germans have it pretty much wrapped up with the BMW M3/M4 and Mercedes C63. But these mainstays are now under assault from the dual-purpose 2016 ATS-V, a car that GM claims can be both an easy highway commuter and weekend track hero. But what’s it like to actually drive in these two settings? Motor Trend’s Carlos Lago set out to find the answer in this episode of Ignition.