Korgasm...

As you know i have in my setup the S80 with PLG/150-PF addon. It really sounds great. Its EP and pianos are excellent. I found them far better than Roland's XP/JV ones. But the new Roland XV is a different case. I found its EP,pianos better than anything i've heard before, expecially using the new (extra) SRX piano PCM board. S80 sound isn't worst, just different. Onboard pianos on both (s80 & XV) are about the same in quality. I found S80 + PF having a litle more bright digital-metalic piano sound that many people like in EPs. I think that XV + SRX has a little bit more realistic samples & feel.
Anyway S80 is very very good and has the right price.
As for realistic piano playing i found XV far better than anything i tried before. Always in my opinion and without having one (XV) in my hands yet.

PS: S80 & S30 are keyboard synths so if you need a rack module then 3080 is the best you could buy.