A few statistics about the 2.0 skyactive and the 2.5 mzr
I looked at the 8 options of 2.5L and 2.0L, HB and sedan, ATX and MTX, then looked at the HP/lb and TQ/lb of the cars.
2.5L HB 2.0L HB 2.5L Sedan 2.0L Sedan
cost 23400 23150 22900 22550
HP 167 155 167 155
TQ 168 148 168 148
millieage 23 32 23 33
weight (atx) 3104 2969 3103 2950
weight (mtx) 3048 2896 3046 3048
HP/lb (atx) 0.054 0.052 0.054 0.053
HB/lb (mtx) 0.055 0.054 0.055 0.051
TQ/lb (atx) 0.054 0.050 0.054 0.050
TQ/lb (mtx) 0.055 0.051 0.055 0.049
It would seem that the 2.5L still have an overall better power and torque to weight ratio than the 2.0L skyactive, which shows in its better 1/4 mile times and quicker 0-60 times. But, the 2.0L skyactive in a sedan has nearly the same HP/lb and a 2.5L engine, but when it comes to torque the difference is a little more consistent.
This does not take into account the fact that the transmissions are different, and if the skyactive car's transmission is better at putting power to the ground, then it could end up on top, but the aforementioned track times would suggest that the 2.5L is still the reigning champion, but not by much.