I don't know if I should be happy about this news. Now my G sedan is the weakest in the whole G family.

2003-04 G35 sedan 5AT: 260hp
2004-05 G35 coupe 5AT: 280hp
2005 G35 sedan 5AT: 280hp
2005 G35 sedan 6MT: 298hp
2005 G35 coupe 6MT: 298hp

From this list I would say the fastest is the 05 manual sedan, which should be lighter than 05 manual coupe with the same engine output.