By the way, in your original post, why did state that you did not photograph anything of "super speed?" Car racing, especially drag racing is definitely super speed for a camera.
My 30D is okay at shooting the drags, not perfect but okay. I would hope the 5D II would be better than my 30D.
That's what I hoped, too. The 5D II is not better. Sometimes it seemed even worse.
5DIII, 5DII, 7D x5, 6D, T2i, T3, 1D X, 10-22mm, 16-35mm II, 18-55mm II, 18-135mm IS x2, 70-200mm f/2.8L II, 24mm f/1.4L II, 50mm f/1.4, 50mm 1/1.8 II x2, 85mm f/1.8 x2, 100mm f/2 x2, 135mm f/2L x2, 200mm f/2.8L II x2, 1.4X III, 2.0X II, 60mm f/2.8 Macro, etc. only had room to list a few Canon items