I prefer Ketron strings, then Korg. Fuller than Yamaha. Wersi has terrific slow strings that work nicely for Viennese music.
I'm familiar with Korg's strings, and agree that they sound fuller and more realistic than Yamaha's, especially on the PA4x. Ketron and Wersi's, however, I'll have to look into.
Thanks for the heads up, sparky589!