Have seen many complaints regarding the sluggishness of the 1.2 jazz in India. Even saw it in an Indian article regarding most underpowered cars in India. Using 5th gen 1.3 city manual as reference, there's no way 1.2 will feel reasonably powered in 6th gen. 1.3 Mt already felt sluggish as hell with more than 2 people and luggage in the car. Plus the price difference between 1.2 CVT and 1.5 base CVT is too low not to go for 1.5, and the 1.5 has some minor extras as well.
Also the Indian fuel economy numbers for the 6th gen 1.5 CVT are better than the 1.2 jazz CVT. So 1.2 city won't even have the fuel economy advantage.