I agree. The Mega has 'Mega Mumbo' down low, but the Sirio will beat it everywhere else!
I own an EVO 3 IFMAR, OS 12TZ, an N12LL3, and i've owned RB's and a Max in the past and the Evo 3 is definately the fastest.
p.s. A stock OS TZ does not come close to the EVO 3, especially on larger tracks.