very nice
much better than the prior renders. nice smooth lighting/shading. however, you are missing alot of detail in your reflection environment. it only reflects the floor. put some objects around/above the car so it will reflect them a very common and trick..and one that works quite well with tweaking is.. making white boxes long or wide.. or even 3-4 close together with a window shape like above/around you car with 100% self illuminating parameter... whitish blue here let me show you something, http://www.3dluvr.com/galr/images/test_renders/mclaren%20reflections01%2000000.tga this is the usual reflection pass i make for my cars. black materials, 100% reflection then i composite it in ps/after effects. also have specular pass there which i think is very important , many make cars like they were 100% mirrors, quite wrong.. all of them have specularity. check this for example, http://www.3dluvr.com/galr/images/count01.jpg the specular makes the whole difference. anyway i think you car shader could use more contrast in lighting. have a stronger reflection for brighter objects, and almost none for dark objects.. like in real life, check for example your t.v. screen.. you can barely see the entire room.. just the bright/white/highly illuminated parts in the room.
