looks alot better!

Shadow blurring: select your directional light and go into the attribute editor.
you'll see under shadows ray trace shadow attributes. Increase the light angle to make the shadow edges blurrier. Increase the shadow rays to reduce the funny noise that you may get from increasing it too much.
increasing both will increase render time (although on your scene it might be insignificant)

reflection blur: i think it's in the material attributes, under mental ray. look for Mi Reflection Blur. Increasing this stuff will increase your render times

remember, when playing with these settings start off low, and increase the numbers until you're happy.