As of now there is no information revealed regarding Mercedes Benz ML 350 CKD but Mercedes Benz ML 350 CDI is available. http://www.cardekho.com/carmodels/Mercedes-Benz/Mercedes-Benz_M-Class
Both Mercedes ML 350 and Audi Q7 are very good SUVs. However, Audi Q7 is more powerful and feature rich, so you should go for the Q7. We will also advise you to test drive both the vehicles before making any decision.