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The fuel is being injected at up to 2600 PSI into a heated air fuel charge in a super fine fan pattern. I would be very surprised if it wasn't vaporizing and mixing better than with port injection. Hell, simply going from 2600 to cylinder pressure in the super fine fan pattern would probably allow for full vaporization, even if the gases werent already heated from compression
At the engine development lab in their Higashi Fuji test center Toyota actually builds glass composite cylinders and uses High speed cameras to photograph fuel propagation throughout the cylinder and flame front propagation. In that way they can be certain of these things.
I don't know if you have seen the piston shape for the FA20, but there is a special fan shaped depression with a ski jump curve on the outer arc. They wait until that jump will be in the injection path, and the fire the injector, which allows the ramp to redirect the fuel straight up at the spark plug and mizing it into the air charge which is compressed into that area.
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