Just found these info.
2.0 VVT// 2.4 VVT
Displacement (cc) '1,998' //'2,359'
Max Hp (ps/rpm) '144/6,000' //'166/5,800'
Max Tq (kg¡¤m/rpm) //'19.1/4,250' '23.0/4,250'
I don't really know about Hyundai,,,but if you look at those numbers from 2.4 VVT engine It has better hp and tq than Honda Accord or Toyota Camry.
Also I found a couple commercial from Hyundai website.
It looks not bad IMO.
http://www.hyundai-motor.com/images/.../sonatamov.wmv
http://www.hyundai-motor.com/images/...f/sonatacf.mpg