I think Karl Sanders is a really good black/death metal singer, although Mikael is obviously one of the best, from growls to soft melodic singing, he can do the lot, just look at Masters Apprentices, benighted and Remember Tomorrow. 3 examples of immense singing ability and variety.
and that's a fucking shame, cause they were brilliant. yet all those noobs out there have no clue about them. the same is with Root. Big Boss kicks the hell out of 99% of metal singers out there...guess these bands' curse is they come from Czech Repulic and therefore they don't get the attention they deserve. it's quite similar with a lot of bands from the former eastern block of europe.