Hi nardoni2002 "mike". Each Korg PA80 key is just shy of being 1/16 of an inch wider than Yamaha's PSR keyboard keys are. 1/16 inch = almost 2mm. As I stated in my previous post I said 'roughly' 2 millimeters wider than a comparable Yamaha Key. If you want to get technical, then it is actually a little "under" 2mm wider.

As to playing the PSR 2000; yes mike, as you noticed your fingers do 'rub' against the black keys when playing inside the the black/white key area. With the especially bad key feel/action of the PSR 2000 the black keys have a tendency to sometimes depress right along with the white keys that are pressed. This is because IMO 1. The keys are smaller and 2. the key action is very flimsy on the PSR 2000. This in turn can cause clashing of sounds 'clams', ie., dischorded clashing and unwanted notes sounding when the Keyboardist did not intend for them to because, again; - the black keys have a tendency to depress with the white keys that are pressed when playing inside the black/white key area. That is another + (positive) for the Korg PA80, Roland G1000, etc., in that they have less of a tendency to do this because 1. Their Keys are 'wider' and 2. The Key "action/feel" is much better (not as flimsy/spongy, etc.) as the PSR 2000 IMO.

Best regards,
Mike