The feel should be different between the two. You're talking sub 3300lbs on the 370z and over 3700lbs on the G37, with essentially the same hp output. Personally, I am in it for power/weight, and 1hp/9.72lbs (approx) for the Z is pretty dang good.
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So keep that in mind. I absolutely DO NOT need this car to be practical in any way, shape or form, the hatch access is gravy.
S.