Although the KRONOS is big and mighty, the KORG M3 is still much sweeter sounding, KRONOS is too DIGITAL for me.
Depends on how you set it up.... your Kronos... it can sound very analogue.... or really acoustic... but then you have to step away from the default settings ...
However fun thing is, the M3 engine is very much comparable to the PA4x engine, which is an advanced version of the M3 engine... and some things are easier to archive on the Pa4x then on the kronos. But thats mostly the advanced stuff like dnc thats added to the pa4x engine and not in the M3..
The one thing i liked most about my M3 was the factthat it was a module build into a keyboard.. yiu could use the 88 keys as lower keybed and put the controll on to of the arranger that was in upper position.