No. FETH musics don't sound like Hiroyuki Sawano's composing style. If you have plenty hearing most of his works, you will definitely know his style. Also goes to Joe Hisaishi, Yoko Shimomura, Yuki Kajiura, Revo, Yasunori Nishiki (the other japanese game and anime music composer that I know so far), etc, they all have their own unique style that easily distinguish. I immediately know feth music composed someone else which i'd never know before, and it's already revealed it's composed by three people : Takeru Kanazaki; Hiroki Morishita, Rei Kondoh (three composers, just like three houses eh?). I'm looking forward to see their other musical pieces!