Well what do you want? They all bring something to the table. My advice, go with the BMW. Less expensive to maintain. More respect. And if you wanna go fast, you can tune it right up for another 100hp.
Luxery, go for the lexus. Probably the most reliable of them. With the Merc right next to to it. in last, is the G37. Which, im not a fan of. I work at a dealer, driven all 4, and would go for the BMW, than lexus, than merc, than G37.
put it this way. BMW, or infinity?
BMW. hands down.
Lexus or Merc?
Probably the lexus. But thats just my opinion from curb appeal. most assholes drive mercs.
so, between lexus and BMW, i would decide that as luxery, or power. If you can afford the lexus, id go for that.. i think.