I think the recording uses close mics and lets the reverb do the job for the room. The bass notes appear to be more direct with less reverb. Very intimate with a long reverb on the higer notes.
Well I'm not really experienced in designing pianosounds. But how about something like this?
Download "Fazioli 212 3 FX.vsynpreset"
It's not spot on. But maybe that could be the direction.
I've put a high pass filter in front of the reverb. That way the bass notes are bit less muddy and more intimate.
I found that some very light chorus on the close condenser mics was nice.
I usually use the reverb-plugins within my daw (Cubase). But the reverb in the players is not really bad.