Hi mc.
would like to here your thoughts on comparisons.
The main difference I hear is that the SD5 sounds more like a keyboard with lower quality samples than the KORG which at no point sounds like a keyboard. It sounds like a band.
For example compare these two.
http://www.ketron.it/mp3/SD5/BigBand.mp3 http://www.korgpa.com/pa_root/mp3/pa2x/Full_Songs/08_Big_Band.mp3 The Ketron bolts out the gate with a blast of music but the sounds leave a fake taste in my mouth, especially that trumpet sound. Where the KORG one seems more like a relaxed professional band sitting back and enjoying the mood if you know what I mean.
Or here's a better example altogether.
http://www.ketron.it/mp3/SD5/Salsa.mp3 http://www.korgpa.com/pa_root/mp3/pa2x/Full_Songs/11_Latin_Salsa.mp3 The Ketron is very weak and lifeless sounding and the drums are very fake, where the Pa2X is again far more professional sounding and live. Again sounds like a real band.
I'm not sure I can find anything on the Ketron that I like better than the Pa2X from a sound quality point of view. Everything on the KORG just sounds far more believable.
As for style programming quality, they are pretty well matched I think.
Regards
James