Google Earth now has a better zest of bathymetry. Some people comment that however (importantly) improved, the new ocean floor is not yet true 3D.
The ocean floor is colored to reflect the terrain features of the sub-sea surface. The new rendering is a bit higher resolution (much higher in places) and is more accurate than the previous version. According to the copyright messages the new ocean floor is coming from "SIO, NOAA, US Navy, NGA, GEBCO", known as good sources for bathymetry. You can see the new ocean floor by opening up Google Earth.