I think one of the things to take from this thread is perhaps a realization that how 'realistic' something sounds depends a lot on the surroundings.

Our arrangers are generally set up to be able to do a complete mix without that much input from the player, and consequently, we often find that certain sounds, when soloed, do not sound quite on the money, having already been sculpted by EQ into something that cuts a dense mix, and doesn't muddy it up. All well and good when you are burying it in a busy style.

But as you bring it further to the fore, those shortcomings show up more and more.

This is why I'm often unimpressed by arranger demos that show off single sounds, and compare them to each other. In context, in a busy mix, they may well fool the ear. But solo them, things often change. Arrangers tend to be voiced for the way most use them... the style doing most of the work, and you merely providing a melody. But start to use them in more exposed settings, and you often have to undo some of the processing added to make it cut the mix.

Squeak did a great job here, possibly the first Yamaha arranger piano solo I have heard that didn't make me scream 'TOO BRIGHT!'