I have to agree with Uncle Dave about Korg's heavy use of effects to mask their samples' poor quality; this habit dates back to the days of M1. To save memory, the sounds were sampled -I guess- at around 10000 Hz, so they were lacking very high frequencies (i.e. the "sparkle").
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.