they are not on the same platform. S60 is on the P2, while the
Mz6 is on the CD3. Well, Ford owns both plats.
T5 - FWD, MPS - AWD
so, MPS while may lose out fm standstill (due to torque loss) but
will def. made up at corners. actually, no....i'm wrong, T5 has
gear limiter for the 1st 2 ratio, so MPS will still be
faster.
T5 is very tune-able w the likes of garret turbo and evolve chip
etc. over 400 horses and Nm is possible. However, too much torque
on just the front axles can be hazardous for the lesser skill
driver like myself 
S60 is heavy, coupled with that kind of speed it can churns out,
big brakes are a must have.
MPS is a new but exciting offering with its specs. Lighter and more
agile than the T5 i bet.
Image wise, the doorman at Raffles hotel would open the door of a
T5 with a smile; he'd also open the door of a MPS but probably
say:"no parking here, Sir". 
