Not correct Fran...

The MOX series is NOT a contender for the Kronos and Jupiter 80.
The MOX is a Yamaha's latest budget mid-range synth below the Motif XF.

The Motif XF is a complete workstation competing with Roland Fantom G / Korg M3...

I would say Jupiter 80 and Kronos are different tools that are more closer in comparison... they are more for pure synthesizer / live performer - which is something the Motif XF is still capable of (sound quality is obviously very subjective).

Nick