The sx920 keyboard feel is adequate, but nothing like the PA4x. It's more comparable to the PA600 keyboard It doesn't have aftertouch, but I only used that on a few songs. Side by side, it's a toss-up. Some Korg voices are better than Yamaha, but I can tweak the Yamaha to my liking. I have two gigs next week, and we'll see how the Yamaha handles the challenge.
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Korg PA4x76, Korg PA600, Yamaha PSRsx920, Zoom L20 mixer/recorder, Turbosound ip500 column speaker system, Zoom B1 FOUR Bass Multi-Effects Processor