I sat anxiously in a showroom Mercedes CLS while the salesman processed my paperwork for a test drive. Even in repose, the CLS is a magnificent machine. Soaking in that heady blend of luxury and gravitas, I wondered if my spin in the B200 (available in Canada and Europe) would capture any of that Mercedes quintessence. Sometimes, brand extension works (Bentley Continental GT) and sometimes, it doesn't (VW Phaeton). So does the B 200 fit in Herr Doktor Daimler's pantheon of pomp and circumstance?