Greetings Datablues & All,
You seem to have discovered that no arranger keyboard is perfect. And each has it's own strengths & weaknesses. You will never find two people here to agree on which synth/arranger has the best "this" sound or "that" sound. Because, what we each like is so personal and individual. I like the piano's on my 740. But they sometimes are better on my KN5000 (depending on which preset effects are chosen). And the Grand piano on the pa80 is WAY better than the piano on the Korg iS40. But they are all different. Nice in their own ways. One other thing, with amplification, most do sound much better. Even headphones do not do true justice. And the built-in speakers, uhhh, are limited.
Tom