SF2 files created by sampling iconic Korg hardware (like the M1 , Triton , or 01/W ) for use in software samplers.
If you want that "Korg sound" without the physical hardware, there are several high-quality libraries available: The Korg SF2: Unlocking a World of Sound Possibilities korg+sf2
The ability of Korg workstations (like the Pa-Series ) to import SF2 files directly to expand their internal sound library. Top Sources for Korg SF2 SoundFonts SF2 files created by sampling iconic Korg hardware