Tekken 6 = PS3 1.32 mil vs 360 0.66 mil
Street Fighter 4 = PS3 1.62 mil vs 1.39 mil
Dead Space = PS3 0.93 mil vs 360 0.93 mil
Bayonetta = PS3 0.39m vs 360 0.34m
FIFA 10 = PS3 2.88m vs 2.24m
Need for Speed: Shift = PS3 1.81m vs 360 1.32m
Resident Evil 5 = PS3 2.73m vs 360 2.56m
Devil May Cry 4 = PS3 1.30m vs 360 1.23m
Those are just some examples of recent multiplatform games which have sold better than or on par with the 360
Concerning Exclusives
PS3 360
Uncharted 2: Among Thieves 2.78m Forza Motorsport 3 2.37m
Killzone 2 2.19m The Last Remnant 0.61m
Metal Gear Solid 4 4.53m Halo 3: ODST 4.54m
inFamous 1.33m Left 4 Dead 2 2.60m
Valkyria Chronic les 0.82m Gears of War 2 5.54m
LittleBigPlanet 3.06m Mass Effect 2.13m
Resistance 2 1.81m Left 4 Dead 2.67m
Gran Turismo 5 Prologue 3.54m Gears of War 6.02m
Ratchet & Clank: TOD 1.84m Lost Odyssey 0.82m
Resistance: Fall of Man 3.65m Too Human 0.67m
SOCOM: Confrontation 0.98m Dead Rising 1.74m
MotorStorm 3.51m Crackdown 1.52m
Demon's Soul's 0.62m Tales of Vesperia 0.48m
Outside of the 360's largest franchise (Halo) the exclusives don't sell that differently from each other. Once Gran Turismo comes out it should be able to match or get close to Halo's sales.
Bet with Conegamer and AussieGecko that the PS3 will have more exclusives in 2011 than the Wii or 360... or something.