What do you want? Sampling space or the "A" Piano? A question only you can answer. Rest is the same.

I need a good sound of piano. But sampling place would be good.
Is possible somewhere find samples of piano for K6 in the same quality like piano on A6?

I would recommend the Forte SE...

Thank you for answer.
But I need only 61 keys with synt action.
On PC3 K6 isn't bad piano, but with comparison with Main stage from Apple is worse.
But I don't want to use computer on stage.
Bad thing is, that It isn't possible to use sample memory and german piano together in PC 3 K6.
Is it possible, maybe on this site get good samples of piano?
Joe.

Just use Google and you find demo videos. There are several people sellling sampled pianos for the K series. "Good" is always very subjective.
https://www.google.de/search?q=piano+kurzweil+pc3k&client=firefox-b&dcr=0&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjq_v_drPXYAhXEzKQKHQE2A20Q_AUICygC&biw=1280&bih=646

Thank you very much fir your answers.....
Joe.