The production car looks great too, but I do see minor differences, some minute. Just to point out a few, referring to second thumbnail:
1) the sideskirt flows better to rear bumper (red)
2) the taillight seemed to extend more forward (green)
3) the spoiler extended further to sides (somewhere between chrome and aero spoiler option) and seems edgier (blue)

Either they heard complaints and changed the concept ever so slightly or they had to make adjustments for safety or other reasons. It's still a great looking car and mods (aka Rampant Designs) can satisfy those who want a different look.

 

Wow I REALLY like how the light shines on the G37 (third pic). I think that's just really beautiful how it hits the car. You could really see the lines in that picture.