Hello,
I've had a PC4 for 4 days, I've never had a previous Kurzweil instrument.
I do not know if it's my ear or what but I find that the sounds do not have much depth, on a more depth (low) at Korg and more fishing at Roland.
I have a lot of synths at home and it's my only Kurzweil so I'm going to keep it for a while but I'm still unsatisfied in terms of sounds... it's a shame.
I would just like to point out that, being a Hi-Fi enthusiast, I connect my synths to very good equipment and the difference is still quite obvious, the extreme triton has a much fuller sound, which fills the room much more.
I hope to be able to have fairly neutral opinions because for my part I am not in favor of one or the other brand, it is just an observation.