What's interesting is there is still is no inarguable "flagship" Grand piano sample. There probably never will be. Most other board manufacturers lead off their selection menu with what they feel is their best Grand. Clavia has always changed this depending on the model, with (usually) the newest sample being Number One. You can view the 'order of battle" for each instrument here:
https://www.nordkeyboards.com/sound-lib ... age-pianos
That means that the White Grand is the current Number One - but I'm pretty sure a lot of people here wouldn't agree that it's the best. On the other hand, the Amber Upright will likely keep its number one position, even with the Baby (and now the Felt) being created afterwards.