Why the Kronos? I am attempting to replace two instruments with one. Kronos has great pianos and electric pianos, the primary role my MO8 played. It also includes the CX-3 engine for organ. When I play out live, it's 50% organ and 50% acoustic and electric pianos.
My hope is that the Kronos can fill both roles, as it's quite versatile. Sound-wise, that'll be no problem. What I'll miss is the light-touch waterfall keys of a dedicated organ.
Kronos is the newest incarnation of the OASYS, which in turn grew out of the Triton Extreme. The OASYS was one of those super-synths you'd read about some overpaid rock star buying two of, but most of us could never justify the $8K price tag. Kronos does everything OASYS did and more, but sells for far less. I got the 73-key version, which was about $3800 after adding pedals and case. Still expensive, but it's replacing two instruments that together cost about the same.
Kronos is many synths in one. Nine, to be exact. Pretty much every synth that Korg has ever made is in there, so the range of sounds is extraordinary, from bread 'n butter pianos and strings to rich pads, synth leads and out-there SFX. It's also a sampler, sequencer, audio interface and DAW. I can't imagine any features they might have left out.
Unlike similar instruments, e.g. the Nord Stage 2, it has a large storage capacity (62 GB), making large sample libraries feasible. The main piano patch is individually sampled for each key, 8 velocity layers, and no looping (each note naturally decays for up to 20 seconds). It sounds better than anything I had for Kontakt. But I could import a Kontakt library if I wanted to. Some users have imported Omnisphere patches.
It has a great UI for live performance (yay!). An 8" color LCD touchscreen with a set list / song list view lets you define 16 instruments/combis/sequences per page (up to 128 set lists total), and include notes/lyrics for each one. Finally, something I can work on a darkened stage without a flashlight!
The Kronos was not a frivolous choice. Sitting here with zero musical instruments to my name, I've had nothing to do but research. I made a long list of potential replacements, watched a lot of YouTube demos and read synth-oriented forums. I won't know for sure until later today, but I'm fairly confident I made the best possible choice.