Bro lets take about power to weight Ratio
Belta 1.0 - 70hp/990kg = 0.0707
Corolla 1.3 - 84/1275 = 0.065
Clearly Belta has better power to weight ratio, hence making it a better sedan than 1.3 Corolla on paper.
Just for comparison
1.3 Swift - 90/1050 = .0857
1.3 City - 100/1155 = 0.0865
1.6 altis - 120/1275 = .09411
1.5 City - 120/1155 = 0.1038
1.8 Altis - 138/1275 = 0.1082
1.8 Civic - 138/1267 = 0.1089
1.5H Vezel - 160/128 = 0.125
And yes Gearbox plays a huge role in how efficiently the power is used.
All figures are taken from Pakwheels.