Oh my god dude. I've been listening to The Contortionist for yearrrssss. I actually saw them live during their formative year and sometime in... 08 - 09. I can't quite remember but it may have been the best (non)hardcore punk show I've been too.
And you can definitely hear the similarities but the biggest problem with the genre they do is it's hard to have your own sound and not do a similar song down the road sometime.
It's the same way with The Tony Danza Tapdance Extravaganza.
Passenger 57 sounds a helluva lot like something from Danza II.
Deathcore is definitely not on my list of favorite genres but when I'm writing, recording, or pretty much doing anything band related it's what I chose to listen to. The raw emotion so many of the bands use on their sound just gets me so pumped.
Another semi-underground deathcore band I think everyone should listen to atleast once is Buried in Verona. Great band from Australia. Deathcore along the vein of Parkway Drive, Suffokate and a little bit of Sea of Treachery(new stuff) thrown in there.
Really great sound, kinda choppy at times with the quality but what can you expect?