I like the 8 mm lens too, i might even be able to make do with a lens at 10 or maybe 12 mm.
BUT ! it would have to be alongside a camera with a wide angle lens, if i had to choose between the 2 i would have to go for the wide angle option as i personally don't feel plate capture is so important to me.
It may just be me, but comparing the x cam with the 8 mm lens to the x cam with CPL filter, each flanking my SG9665GC, it seem to me that in many low light situations ( not night ) the 8 mm lens give me a better chance of getting a plate capture on a oncoming car.
I have noised this "fluke" several times going over footage.