Why Korg doesn't list it in the specifications suggests it may not have an octave function. But the two sets of two buttons on the right side of the PA600 may suggest otherwise. Although I can't make out what the words above the "- +" buttons say on the right side of the keyboard.
The PA600 allows up to 100,000 events but Yamaha doesn't list the song recording event allowances for the S950. Although if past PSR models are any indication then the Korg probably blows the Yammie out of the water in that regard.
Korg does not specify the "octave feature" because is too basic to even mention...

But it is there. On top of the buttons says "upper octave". It is right next to the transpose buttons - which makes sense. The general layout anyway is almost perfect...
The other issue does not even stand a comparison. While Yamaha does not really have an sequencer, Korg's is simply amazing. Both for full songs or style editing.
But this is a little bit OT, so I won't detail.