comparing this to the Casio is probably apples and oranges, but based on the piano playing experience alone,

The Casio has 88 keys, the Kurzweil has 76.
The Casio keys are fully weighted with the lower keys slightly heavier feeling than the higher keys, the Kurzweil is semi weighted.
The Casio has 16,256 velocity values, the Kurzweil has 127.
The Casio has damper resonance, the Kurzweil doesn't.
The Casio has ivory textured keys, the Kurzweil doesn't.
The Casio has 128 polyphony, the Kurzweil 64.

Nevertheless, piano sounds are personal, and the Kurzweil probably has many advantages for a gigging musician. I wish Cdog46 many years of joy with his Kurzweil.