The 1.2 shouldn't be any worse than a 1.3 in terms of ability to carry a full load. It's not really a 1.2, but a 1.25.
Just look at the specs:
Kia 1.25l: 83 hp 121 Nm
Toyota 1.3l 2NZ-FE: 84 hp 121 Nm
Honda Jazz 1.3 iDSi: 88 hp 121 Nm
Honda Jazz 1.3 VTEC: 100 hp 128 Nm
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So it won't have top end power, it has more than enough torque to compete in this category. Engine size ain't nuthin but a number.
Ang pagbalik ng comeback...
I bought a 1.4ex m/t rio. Performance is really good. Perhaps because of a sub-compact weight. But what surprised me was the 8.9L/100km avg consumption on EDSA TRAFFIC! For those who travel at Edsa specially coming from fairview know how bad traffic is. But getting an avg of 8.9/100km is amazing..