I like the Piano & Synth Sounds. I sort of prefer the Yamaha Motif, but the Kronos has more features. Plus you can download DX7 Patches for it which is great.
Because I've owned this for 6 years and it's still up there with the best and still doesn't sound dated. This could get me through any musical situation and I have no intention of upgrading.
You need to get your act together korg or you'll go out of business lol