BMW is rapidly becoming the Swiss Army Knife of automobile brands. Elegant and well-trained coupes, estates and sedans? Check. Interested in CUVs of both respectable and questionable utility? They got you covered. Though the X6 and 5-series Gran Tourismo are answers to a question nobody asked, the smaller, racier 750i Sport treads dangerously into well established 5-series territory. And while the 5-er and 7-er’s pasts are more than a little intertwined, should history repeat itself?