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I have a PC4 (and previously an SP6)...same piano sounds between these two. The PC4 provides after-touch. I think the sounds are very good. One of my references...my KAWAI RX-7 Artist grade acoustic grand.
...I've owned a variety of other keyboards (Rolands, Korg, Casio, Yamaha). I'm very happy with Kurzweil PC4, not just for piano, but for it's extensive flexibility and sound collection.
For live performance, many keyboards have pianos...the catch is the sound system you play it through. ...I still haven't found the best sound system yet.. to my liking...
A percentage of players have a degree of concern regarding the keybed action (on any board). A lot of that is personal preference. I wander around some 4+ years before honing in on the Acoustic grand (Kawai noted above), that had the best combination of response, keyboard action and overall sound. The PC4 does have a very large amount of keyboard touch options. 10 velocity layers, and 7 pressure map adjustments. Between the two, fuzzy math indicates 70 total combinations - many of them would not be suitable for piano performance, but more than enough.
A demo of Kurzweil PC4 piano sounds
In addition to the on-board sounds provided...there are scores of legacy Kurzweil piano sounds (previous version boards) that could be loaded as well as 3rd party products.
What's good about Kurzweil APs is how well they sound in live gig situations, at least that's my experience. To be precise the last I used in such scenario was Artis/SP5 era. You can have multigigabyte piano library with complex sound, but when played live, especially in 'mono' situation, sound complexity it's not what matters the most.
As for the new key action used in SP6 or PC4 I only once tried it in shop. Not something Kawai MP11-level, but it does it's job and is pleasant to play with.
I’ve owned a Kurzweil Forte and gigged it full on for 4 years. It’s pianos worked very well for both live and studio. The PC4 has inherited the majority of these albeit the big pianos are cut down to fit. I also own an RD2000 and an PX5S. Much as I like the Vpiano, I don’t like the Roland’s piano sounds live unless I’m using IEM. The PX5S on the other hand works fine in most live situations, it comes across as both solid and meaty, cutting through nicely. It’s a great gigging board. You just have to be careful with the internal gain staging otherwise it can overload the internal bus and distort the sound.
My favourite though was the Kawai MP7se which is a great piano anywhere. And it has a reasonable set of supporting sounds and midi controller facilities.
Piano Journey: 1930's Upright> Rhodes Mk2 73> Wurly EP200> Gebauhr 1905 6' Grand> Yamaha P250> Roland RD700SX,RD700GX> Nord Stage 2 HA88> Roland RD800> CASIO PX5s & Kurzweil Forte & Kawai MP7SE> Kronos 2 61, Roland RD2000