The new BMW M5 has arrived, boasting a boatload of power, oodles of luxury, the traditional German refinement, and even a performance AWD system that’ll go full Gymkhana-RWD-smoke-machine at the touch of a button. Sweet. So then, it seems like all the stuff you’d expect, plus a ‘lil extra on top, right? Should be about right for anyone looking for superlative performance in a high-status package – a.k.a., the standard M5 owner. But here’s the thing - the Bavarians aren’t alone anymore. The luxury performance four-door segment has more than a few tempting options on hand at the moment – take, for example, the Cadillac CTS-V, a tire-shredding monster with every intention of toppling the Teutonic status quo. Both rock sports car specs, plus acres of hide and top-shelf opulence. So how do they line up?