overall objective
What is your main objective? If you are not a pianist at heart, then total realism is not going to matter. If you are adding piano tracks to a rock song, almost the entire modern generation does not know the difference between a kazoo and a saxophone.
I'm a pianist and a composer. Besides rock and electronic stuff, I love classical composition concert grand playing, solo performances, where every note sounds like heaven. I'm critical of the technique as much as the piano chosen for the recording. I love some classical music where the complement of the instruments work off one another, as they are "speaking" to the listener, and the expression is, of course, all acoustic, including the horns.
IF you are using reason to make modern music, hip-hop, rock, and just about anything in the realm after 1980, abby road samples or the steinway recorded samples should be able to find their place in your mix.
IF you are attempting to use Reason to convince us of a new jazz trio recording (piano, standup bass, and kit), then you may be right in searching for a better piano sound.