It's really hard for me to go back to 16 bit samples after having used 24 bit samples. I use to think that gold sounded good and still does but once i got SISS in 24 bit i got to say Gold sounds kind of cheap in comparison. I would assume it's the same with VSL.That's comparing rotten apples with a screwdriver. The quality of the recording means a lot more than the bit depth of the samples. Then there is the sample engine and your equipment that have an effect on the sound quality. The difference between 16 bit and 24 bit end product is almost negligible if both are made from 24 bit source files and the possible editing has been done in 24 bits.
My example may not be perfect but it still work IMO. ANyway, you listen to user demos done with Gold and Platinum you will hear a huge difference.