Nick,

I sell them both the T3 and the PA800,

1) Is the anything significant feature wise that I will be loosing if i go to the Korg as opposed to the Yamaha? i dont mean Super Articulation, I am talking about things in the menus, style functionality, sequencing, realtime button opertaion / ease of use on the fly etc etc

I personally feel the Korg has a better set-up for live play, other than that they both are very good in all respects, both are different animals so it won't be that easy to get into one as deep right of the bat

2) Has anyone converted Yamaha Styles to work with the Korg?

I've seen them haven't heard any

3) Is there a Cakewalk instrument Definition file available for the Pa 800?

yes, you can get it at korgpa.com

4) Is there any difference in quality of sounds from the PA 2X to the PA800 or is it just some features?

There is a slight difference in the DAC outputs, giving a slightly better sound output form the pa2xpro, other than that same engine