Hi ShiroKuro
I've only ever played with another Piano/keyboard player once. A chap I used to work with (over 40 years ago) played Piano and we had a few jams together. At the jam night I attend we sometimes have 2 keyboards, but that's so that we can realise an arrangement, so one keyboard might be doing a horn part, and the other Piano.
I've never played classical music with anyone else, and I don't think I want to. For one thing the standard of playing required to play in a classical situation (of whatever type) seems to be so much higher, and secondly I consider it a solo discipline. I think the simple truth is I'm a better non-classical player.
Cheers
Simon
All round average Jazz, Blues & Rock player.
Currently working towards ABRSM grade 8.