That XK1 sounds pretty good. Personally, I think it sounds a little bit more 'metallic' or stark or 'less warm' or something?, than the Nord C1/2, but still sounds better than the organ in any arranger I've heard. Although I prefer the Korg arrangers to the Yamahas (just like the styles better), I have to admit that I like the 'Hammond' voices of the Yamaha better than the Korg. I don't really use either since I have the Nord, but if I had to choose, I'd definitely pick the T2 over the PA1x for (hammond-type)organ voices, especially those with simulated 'Leslie'.
On another note (Hijack alert!

), I'm always surprised to see so many arranger players concerned about the quality of the organ voices, but then, if you listen to most of the musical offerings posted, you will rarely hear any organ, either featured or as pads. Same, to a lesser degree, with the quality of the piano voices. My personal opinion (worth nothing, BTW) is that the organ voices on most current MOTL or TOTL arrangers, sound just fine in the mix. Don't believe it? Just listen to some of the factory intros and variations that feature organ. As usual, it's the player (plus the use of an EXPRESSION PEDAL).
chas