No. The A380-800 wing is designed for the higher weights of the -900 stretch (which has yet to see the light of day, sadly). So, the wing isn't nearly as highly-loaded as it was designed to be.
Therefore, the A388 is NOT as smooth as it could be.
Conversely, the 747-8 is more airplane on a similar wing to the 744. They did make some changes, but the surface area, if I'm not mistaken, isn't hugely different at all. Therefore, the 748 will likely handle turbulence more comfortable than the 744.