With so many options to choose from, the mid-size sedan segment has never been so competitive. Renuka Kirpalani and Nikhil Bhatia test the Hyundai Verna, Honda City, Maruti Ciaz, Skoda Rapid, Fiat Linea, Ford Fiesta, Nissan Sunny and the Renault Scala in the popular diesel-manual spec to zero in on the best all-rounder.