I have to agree with the OP on this, I loaded up Giga Boesendorfer 290 (yes I still use g-player/64 A LOT!!!) and the 4Front Sapphire, vs. IvoryII...
Like he said True Pianos is LOUDER...(I went into the module and turned down the output) I also tried as best possible to match the dB of each piano (I would be interested in knowing how the coders determine unity on these samples but don't really want to research it)...
IvoryII (which is friggin huge) really does sound more realistic...
They are all good...giga was a little thin but had more "wood-character"...
True pianos is completely usable as well...
Really...whadda we got to complain about they all sound great.