Amazing combination of luxury and performance. I have the 40 series summer tires and the cornering is amazing. Looked at the G35/M35 (owned 2 other Infinitis) & 535. The G35/M35 turns WAY too many RPM on the highway - 3400 versus 2300 (GS) at 80. The 535 was TOO expensive, $15,000 more out the door with comparable equipment. The GS is faster than the M35 plus gets several more MPG.
Automatic wipers. Power with MPG. Put your hand on the handle to open the door (any door) and the car automatically unlocks. No buttons to press. Mark Levinson stereo is amazing.
Bigger trunk. Expand XM display past 16 characters. Automatically lock doors when driver walks away with key fob.