I've never held a plastic gun since I've had my PPQ that made me any more enthusiastic than "meh." Nothing really comes close for me. On the other side of that equation, I've never held or shot a Sig or CZ polymer gun without wishing I was holding / shooting the steel version. It's not that their polymer guns aren't nice, it's just that they don't come close to their steel counterparts. It's kind of like after owning a 3/4 ton diesel, I can't imagine owning a 1/2 ton gasser again.
But that's just me, and I freely admit I could be wrong.
I don't know, the P09s are very sweet shooters indeed.