Just watched it and IMHO it looked fantastic, grain appeared intact with no artefacts i could see,colours looking great. The 2012 restoration of the Japanese footage looked like it had always been there and considering the state it was in is a remarkable achievement (watch the extras regarding how they did it) and i challenge anyone to see where it was inserted.
Hammer have taken a lot of stick recently but seem to have pulled out all the stops on this one, yes it is not demo quality but i think it is the best it will ever look or sound and well worth every penny for this Blu Ray release.