Usually it's because you need to turn up your subdivs in something. Maybe your reflections in this case?

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[Link to www.3dprevis.com]

hmmm, in my opinion you just need to turn up your render setting ( especially in image sampler & noise treshold ). and turn up subdiv in material & lights shadow.... hope it help you.
by the way, the grout in floor material is too big...

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i'm from indonesia

sorry my english is bad
[Link to hermawanwibowo.deviantart.com]

than you guys!!!!!!!!thanks for the advice and help!!!!!!!

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i wish i can do that too......
i need more practice....

I like the v5! awsome! I can see you're using vray, what you can also do is going into the Settings tab in the Render Setup, there go into Light settings, and usualy I doble the Diffuse Subdivs, that crancks up the smoothness as well.

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MuS@shiROth