I have a Sony 9000ES and it has played every DVD-A I have tried. It is probably playing the DVD-V layer. I think the DVD-V layer is 24/96.
I'm still a little confused about the difference between DVD-V and DVD-A, but I think DVD-A can play back a sampling rate of 192, whereas DVD-V can only do 96. However, many DVD-A layers seem to be 96, which means they are the same as the DVD-V layer.
So the Sony lets me enjoy both formats with one player, while the market sorts out which will survive.
If anyone can help clarify or correct my understanding of DVD discs, your comments are welcome.