OK: This is the BEST ROLAND piano sample that existed from 1996 to 2000. It is the stereo piano from the SR-JV80-09 expansion board "Session" released in 1996, and it was presumably sampled from a Bösendorfer.
So for its first 4-5 years it was only available as an expansion. Even if there was an older expansion only dedicated to pianos, this piano on the session board was much more advanced, as it had separate left/right samples and two sample layers (piano and forte). The entire expansion had 16MB in 16bit format with many, many sounds, so the piano could have had nor more than 8MB max. In 2000, the heavily improved SRX 02 was released (64MB in 16bit format).
Now, "1996" sounds old, but this is an example of how the expansion boards were some years ahead of the preset sounds of the instruments: This same sample was used for the "European Grand" in many Roland synthesizers in the 2000s, it was the main piano of Juno G (released 2006!) and one of the three pianos in Juno Stage, SonicCell or GW 8 (2008-2013). So, in fact, Roland used this sample for about 17 years in total.

http://www.synthmania.com/sr-jv80-09.htm

http://lib.roland.co.jp/support/en/manuals/res/1810945/SR-JV80-09_je4.pdf