Before getting my G, I test drove all 3 (370z, g37 coupe and sedan). I honestly can't say any of these three shift differently from one another. In stock form, all have vague clutch feel with narrow friction zone. The weaker clutch spring does help alot. However, if you got $$$, there is a fully adjustable replacement clutch pedal assembly available. IIRC something like $200 or $250 for the kit.
More info available here
*RJM Performance.com - Home
For me, the weaker spring is a fine fix. I'm used to driving cars with heavy clutch pedals that have high uptake and small friction zones (my late 90's camaro was very similar).