If it is piano, you will be disappointed with this instrument. The Yamaha or even the Casio would be better for piano sound quality voices.
Keyboard action is okay but taking all this into consideration, bear in mind that it is located on Korg's entry/intermediate end of its product lines and is not, to me, Korg instruments at their best.
The Yamaha and Casio are not as loud as the Korg I believe, the Yamaha being a lame 6W x 2, and I dont know how loud that is, but I know the Korg is nearly double the output in Watts at 11W x 2! Its important I hace decent onboard speaker system too, very important.
Thanks, any more advice would be greatly appreciated
The piano sample is acceptable, but again, you'd be hard pushed to find something in the same price range with more powerful speakers.
To my ear, the P140 has a clearer and slightly more realistic tone than the Roland FP4. The FP4 has a more mellow and smooth tone, but these are subtle differences.
Whichever you choose, I'd seriously consider some kind of additional amplification to help the sound carry, that is unless you are using an in house PA system. Smaller speakers get sucked up by crowds