I must be the only person in the world is not all that impressed with Khan. I think his vocal tone is good, but not incredible.
I'm gonna catch some shit for saying so, but when I sing Kamelot songs, I find them a bit effortless compared to a lot of other shit. Silent Force (DC Cooper) for example is very very difficult to get down, so is stuff like Tribuzy for the insane range alone. I just don't see what warrants all this praise the guy gets. Sure the songs are good, but I don't think the guy has recorded anything any other pro singer is going to struggle with.
I think Khan, if he is writing his own notes, chooses the easiest and most familiar note progressions. Some of these singers are crazy. They will write out a 15-not progression on an acoustic guitar and woodshed it until it's clean and perfect...then work on the next line until they have something that would take anyone else probably a few days just to figure out for each song.
Fabio seems to be having an easy time with it. I seriously doubt Khan could sing most of Fabio's work from the first two VD albums.