I came to the conclusion that if you both wand the good things of Korg and Yamaha that a Tyros 4 and a Kronos 88 are a match made in heaven..
Tyros 4 : Best accustic instrument simmulations (SA and SA2), biggests style database in the world with high quallity styles available for every immaginable song, Easy access yamaha feautures, the Yamaha sound, works great out of the box, verry nice 61 keys keybed, great sounding organs, high quallity vocal harmony processor.
Kronos 88 : Best sounding synthsounds, awesome strings and piano's, KARMA, very good 88 keys hammer action keybed, indepth synth edditing, lots of controll options and programmabillity options..
If you don't want to use any software based solutions.... this is the best combination a keyboard artist could wish for. A mix made in heaven with 2 instruments that have their strengths where the other instrument has its weak spots.
For those of us that use 2 keyboards, its certainly something to consider.
From the things i have seen and heard so far, Korg is missing the boat with its PA3X unless they quickly come with a software update that adds some amazing features..