"Way better" is quite the hyperbole.
LCD2 has the better bass, both headphones have comparably great midrange, while HE500 has a lead on treble.
Both have great separation, neither is superb at soundstaging, and HE500 has a more open wide sound, just as LCD2 has a more focused deep sound.
Electronic music isn't just all bass, it's also big on the treble and staging, and midrange is also relevant; in that regard then it's up to personal preference which headphone has the best aligning attributes.
Between your HE500 and HE400, which one would you say is better for electronic, trance, house, and rap/hip-hop?