Anything that was PS2 or earlier is no longer strictly exclusive, simply because over 95% of the system's library is compatible with PCSX2 (and ePSXe probably has an even higher rate with PS1 titles). That includes both Persona 3/FES/4 and Yakuza 1/2 (I
did forget about both series). The
later games, OTOH...
This list is a lot longer than I thought, but it still needs to be filtered for what's not yet playable through RPCS3 - because the list of games that
are includes Asura's Wrath, Demon's Souls, Disgaea 3/4/D2, Ico, Yakuza Kenzan (but not any of the others), and every PS3-era God of War except 3 and Ascension (including the collection versions).
I'm ignoring PS4 titles because the system is still current and PCSX4's compatibility with standout titles is too high for me to believe.