The Mustang and the G37 were on my list when I was looking before buying the Camaro. Also on my list were: IS250, TSX, CTS coupe.
The Infiniti had THE best interior - comfortable, bells, whistles. I did not want to get out after the test drive!! Sadly, the used one that I test drove had transmission issues. And the new ones were $$$$. A bright red G-series coupe could still one day be in my future...
Mustangs are fun and much smaller (than say, the Charger).
All good options!