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As Kalyani pointed out there are 4 models. Lets go through them one at a time.
1 The X-Type is based on the previous Ford Mondeo platform and is comprehensively outclassed by the Audi A4, BMW 3 series and Merc C-class.
2 The XF is a very good car and aesthetics aside is currently one of the best cars in its class, but in India it is priced well above its rivals the Audi A6, BMW 5-series and the Merc E-class.
3 The XJ is a large premium luxury saloon competing with the Audi A8, BMW 7-series and the Merc S-class. While advanced the XJ is styled conservatively and while it almost matches the 7 and the A8 in many areas, the S-class betters it across the board as a luxury car. A new XJ is expected anytime now.
4.The XF is a luxury coupe/convertible and is a very even match for the Merc SL and it is a slightly better all round car than BMW\'s excellent 6-series.