No, it's just off, the whole shape to the front of Vader's mask sucks once you start moving from a front view towards a profile, and the areas that are off are nowhere near where it goes into the dome, and really, even though it's not a reveal head, Sideshow's dome comes off, so that function doesn't affect the mask either.
Medicom's was the best, certainly better than Hasbro, but there was room for Sideshow Vader to be closer to the movie. Slight dome issues aside, they've just about hit a bullseye with it. I'd like to see alternate domes on future Vaders if this isn't permanent LFL dictation (if so, screw LFL), but as far as the mask goes, it's perfect, adjust the triangle on the bottom accordingly for ESB/ROTJ and that's it, keep every other detail the same.
