Fair enough

I just did a (fairly subjective) test, to me it looked as though the exposure changed consistently up to 1/16,000th of a second; although 1/32,000th was slightly darker then 1/16,000th, it didn't look a full stop darker, so maybe the shutter couldn't quite keep up...
To be conservative, with my S100, I'm going to use a
maximum shutter speed of 1/10,000th. Cheers,
AndyC