I drove both the Acura TL and the Infiniti G37x.
extremely fast (almost too fast) with solid handling.
Interior is nice, but seemed a little on the cheap side.
Leather was nice, but I heard a few squeaks during my overnight test drive.
I am 6'1" and 250lbs (wide shoulders).
I was somewhat comfortable in the G37 but had the driver seat all of the way back and don't know how comfortable I would be after a 2 hour drive.
Backseat was tight.
Almost as fast as the G37 but not as fast (still PLENTY of power!)
Interior was much more comfortable.
Handling was just as solid as G37.
Interior quality is nicer then Infiniti.
Pricing = same exact monthly payment
-Quality of interior in Acura
-Power of TL (even though not as fast as G37.... I don't think many other sedans are faster then the Acura TL.
Reliability - I had a TSX (Acura) before the TL and did not have one single problem with it.
I have had the TL now for 3 weeks and love it.
I get excited whenever I drive, and look for reasons to get in the car and go on nice long drivers.
(Especially in "sport mode". )
I was disappointed that the backup camera only came with the navigation package.