Lee's arms are the best tricep/bicep/forearm combo, period. He extremely vascular in many of the above shots.
He has the the best balanced arms ever and they are more detailed than others in that category (Oliva, Scott, Viator).
Each of the muscle groups is thick and dense and separated, maybe not as much as Coleman but still great. All three heads of triceps are better than Coleman (compare videos of them working triceps) and his biceps are thick and freaky, just different than Coleman's...similar to Levrone but his are awesome too.