Wait for another 8 months, they have to cut more duties each year and end the whole Customs duty thing within 2 or maybe 3 years now, the whole suzuki/toyota game will be finished.
For now, Sonata will definately give a bad time to Toyota Camry, Honda Accord and lot of imports like Accord 2001/2003, Premio, Mark-II, etc.
And Yes if a local Civic costs 15 Lacs, then this 2.4 Liter car for 18 Lac has definately charms for 15-16 Lac rupee budget buyers.