I do not own the PA80, just a Yamaha upright piano. The piano on the PA1X did sound different from the PA80 but I did not really compare them side by side. For me, the sound of the acoustic piano within the context of an arranger keyboard is not very important as I tend to use electric pianos, guitars, woodwinds, brass or synths for the solo parts. Besides, piano is the hardest instrument to emulate and we all know just how little of the sample memory is devoted to each instrument. So, any so called "review" of the acoustic piano sound is really a moot point to anyone who is used to playing a real thing, unless we are talking about a huge sample library. But, you have made me curious and I will listen carefully to the piano next time...