Czech Black Metal bands always had a knack for being utterly original. Root and Master's Hammer don't sound like any other bands at all. Greece showcases bands like Necromantia, EARLY Rotting Christ and Varathron, all completely excellent, with Italy sporting the incredible Mortuary Drape. Barathrum from Finland is one of the strangest fucking bands I've ever heard in my life, as is Beherit (mostly on their second album), along with the awesome, doomy Hail. Then of course, Deathspell Omega, Countess, and from the US nowadays, Xasthur and Leviathan. These are pretty much the entirety of my favourite BM bands other than the quintessentials (Bathory, Tormentor, Mercyful Fate, Sarcofago, Mayhem, Burzum, Darkthrone...), and I find them all to be strikingly original, not "copycats."
Copycats, I believe, would run along the lines of shit bands like Dark Funeral, Naglfar, almost every US citizen in stupid fucking makeup, etc. Usually it involves totally pedestrian use of liberal blast beats and tremelo - BORING. Only a handful of bands have pulled that off extremely well (going back to the quintessentials).