If you are using HD characters, please re-initiate them with the new character pimper after updating the CM!.You must enable HDR, when using the dynamic shadow enhanced maps.Especially the model setting must be at 'High' or you'll get facial animation errors with HD models.
It looks and sounds very different compared to vanilla HL2. Cinematic Mod (CM) is a Half-Life 2 modification, that adds more details and a darker look to the original Half-Life 2 series.