On paper the Forte's Theta II wins with 192Nm at 4300rpm and a similar output of 115KW at 6200rpm.
The Civic in comparison produces 114KW (6200rpm) and peak torque of 188Nm at 4200rpm but then again they are merely numbers.
The Lancer's engine is pretty much similar to the Theta II due to the World Engine collaboration. I wouldn't expect the Civic to smoke a Lancer though.
It's worth mentioning that none of the those engines above are charged so there are apparent torque dips in low rpms - the engine only comes alive at rpms above 3500 yet how often does one rev till that extent?
In real life you'll probably care more about handling rather than straightline acceleration; and for me who owns a Forte and has experience with the Civic (albeit 1.8L) they are more or less the same with the Civic feeling just minimally tighter and sharper in terms of steering feel.
However the Forte does loses out by having an inferior 4 speed autobox although there's the sportsmatic mode for more aggressive shifting.
The Civic 2.0 in Australia comes with paddle shifts for feel good factor but I'm not sure whether the ASEAN models come with it or not.
As stated before, Japanese and Korean C segment cars are more similar to each other than they are different. It depends on what you like and what you are able to afford. Right now the pricetag of the Forte is still pretty much the main attraction although it would be unfair to overlook the car's other great aspects.
U have forgotten another big factor which is the WEIGHT of the car. When we talk power its always a power to weight ratio that must be compared. Not mere numbers.