The basic shape is a winner, but the lack of differentiation between the different levels leaves the upmarket Calais/Calais V looking little different from an Omega. The only real differences are the chrome strip at the top of the grille, the wheels, tail-lights and lower front valance with fog lamps. There's also a chrome strip along the sills on the V.
I reckon the front end needs a bit of dressing up, particularly in the dearer versions. A little more brightwork, perhaps a chromed grille surround and exclusive colours would help. Someone else has said to reduce the size of the front wheel arch flares and on the base models, I agree, because they only look good from head on or when approaching alongside from behind, when the arches are filled out with decent wheels and rubber.