Polyphony isn't the whole story, guys...
Firstly, on models with less than 64, there's the issue of how well does it deal with running out of voices? Some are more forgiving with this issue than others...
But the main thing is... Just how fast is the main voice board? It's all well and good to be able to run a dense sequence, and play four sound layers on top, but what happens to the timing and 'feel' of the sound when you do? Once again, some are better at this than others...
One thing I noticed as night and day when I first got my G70... Layer four or even five Tones together (even stereo ones), all with sharp attack characteristics, and pound out REALLY tight four or five note chords, as fast as you can
Not even the TRACE of any 'flamming', which my older, Sound Canvas-based G1000 would have had a fit with! Even my K2500 can't do that (not much can, actually
)
It's not how much you've got... it's whether you can actually USE it (ask any girl!)