It's easy enough to thin out a rich piano into something thinner, an altogether different thing to make a thin piano rich...
Yes, the Yamaha pianos work very well in a mix, but play solo piano on them, they start to show their weaknesses. Better to have a solid solo piano and cut the mids with EQ, that to not have a great solo piano in it at all.
IMO, etc., etc.!
Nah...
in my opinion they sound great solo and/or in the mix. I couldn't want for anything better...seriously!
Again, it's always going to be one's
personal idea of what constitutes the
ideal piano sound.
You like Roland's piano sounds, as per the G-70...I couldn't warm up to
any of the pianos on it...they just don't work for
my style of playing.
I do remember the Rhodes emulations were rather nice, but the acoustics just didn't have what I like to hear.
I'm spoiled.

Ian