I don’t personally own any 7-string guitars, but Schecter recently introduced a 7-string electric guitar with fanned frets – what they call multiscale – where the lower strings (low B, low E, etc) are longer than the high strings. This makes all of the frets look crooked or “fanned”.
Very cool – though I would never want a guitar with fanned frets… I can’t imagine it does wonders for muscle memory and navigating a fretboard quickly.
http://www.schecterguitars.com/guitars/2018/c-7-multiscale-sls-elite-detail