I am not saying that the px560 is more pro it is just the top of the line and the most expensive.
At Bax-shop, the adviced pricetag is 1250 for the 5S PRO and 1199 for the 560. the 5S is the only Casio Privia with the PRO tag. And an S (from stage) these 2 keyboards arent even in the same league.
The 5S is a Pro Stage keyboard...
The 560 is a Home arranger piano...
We should stop comparing them, we also don't compare the DGX with the CP4.. because thats how big the difference is between these 3 keyboards.
Yet, the quallity of the soundset (strong in Synth, piano, DP, strings, organs) is still much more suited for a Stage piano... then for an arranger engine (weak in brass, winds, sax, guitars and other acoustic instruments).. And not thats in this case not just my opinion, its backed up by all reviews i have read on the sound engine of the Casio.
Maybe thats why you keep naming them both as in the same league, because they both are strong in the piano and keyboards division. Maybe even close to the Havian from Korg. But they loose the 560 looses much of its color when it comes to the arranger part. Where the Havian 30 has the propreity Korg arranger engine.