The 2012 Infiniti G37 is one of the most responsive, communicative, and fun-to-drive sport sedans in its class. With a near-ideal weight distribution, a well-tuned suspension, and steering that even the most demanding enthusiasts will like, there's a lot to love here from a driver's perspective.
Infiniti's 3.7-liter V-6 is a little too raucous for some luxury-performance tastes--and not nearly as smooth as BMW's excellent turbocharged six--but it has enough muscle to satisfy rabid performance enthusiasts. A base G25 model gets a 218-hp, 2.5-liter V-6 that's smooth, by most accounts, but doesn't give nearly as strong of a performance kick. Shift quality with the seven-speed automatic transmission in the G37 Sedan (the only transmission in the G25) is somewhat lumpy and indecisive in gentle driving, but it becomes snappy and smooth when accelerating hard; magnesium paddle-shifters and a smart throttle blip for downshifts when driving hard makes the combination all the more satisfying--though the six-speed manual is great as well.
Price no object, the G is also quite possibly the best-handling sport sedan. Even on less-than-perfect surfaces, the suspension is hard to fluster and brakes are stout. In particular, the G sedans manage to get steering feel just right; the quick-ratio system unwinds smoothly, loads evenly, and transmits some surface feedback, as a good sport sedan should.