First, numeric scores are just a reference, but take into account that the high scores of the Ig version were due to Andy and Carol , and none of them were in the Graphene review.
Main differences are:
1. The grip shape, the new extreme have Tk82s pallets (the ones used in the Speed line) so the grip is very "wilsony" and not so rectangular.
2. The paint job, although it something subjective, I think the Graphene version looks much better, dark metallic blue with neon yellow is very eye-catching.
Less evident differences ( basically they are the same racquet):
1.I find the feel of the new version to be crispier, and a bit more solid, whereas the Ig is more dampened.
2. The new one has slightly more plow, and the Ig is a little bit more maneuverable.