Civic: too rice boyish style, supposedly good engine performance but coupled with CVT transmission.
Jetta: probably the best performance but questionable reliability and service and RV drops like a stone.
Mazda 3: seems decent, but overall exterior design proportion doesn't look good to me.
Cerato: not interested coz Korean, RV also drops like a stone.
Elantra: also Korean like above.
Altis: also seems decent, the best exterior look IMHO, maybe lacking some features of the others. I've driven this car overseas for over a week for long distances and seems not bad with great fuel consumption, but just typical boring car.
Focus: probably also rival the Jetta for performance but also questionable reliability and service, or ease of finding parts. RV also drops like a stone.
Sylphy: decent exterior but more uncle-ish look of the bunch, good comfort and leg room, the weakest power and slowest, also with CVT.
SO, if I were you I also don't know which one to choose, none really a perfect choice. Maybe only either the Mazda 3 or the Altis, the rest are no. I'd rather buy a used D-Segment actually than any of those above.
Sub 140k C Segment Sedan in Malaysia, Pick your choice