After The Mountain, comparing Haken to DT doesn't make sense to me anymore. On Aquarius and especially on Visions, comparisons to DT were easy. The Mountain, however, is different. Take Preidolia as an example, a 11 minute song that doesn't have any clear guitar or keyboard solos. Where do you even start to compare it to a DT song?
I don't feel comfortable expressing my opinion too loudly after only two listens to DT12, but I can say one thing with certainty: The Mountain is crazier and more eccentric than DT12, but still manages to be more cohesive and accessible. DT12 sometimes seems to act as if it's more complex than it really is.