So, I found this great piano soundfont, Keppy's Steinway Piano. This piano really makes piano MIDIs come to life with HQ WAV samples from a Steinway D-274 Concert Grand. Plus, it has dynamic filtering (spectral morphing) to make dynamics in piano arrangements come out and multiple presets, so you can make it sound melodramatic (sad), deep, bright, etc.
http://kaleidonkep99.altervista.org/keppy-s-steinway-piano.html
Audio Demo: https://soundcloud.com/kaleidonkep99/cs-toycube-pf-rx-verspl-keppys-steinway-piano-401
To use the SF, make sure the MIDI is set to the instrument 000 (Grand Piano, not bright or anything like that). Then I find the best method to convert MIDI to HQ WAV to use KMC. Get KMC here: https://github.com/KaleidonKep99/Keppys-MIDI-Converter/releases
Install it, import the MIDIs, import the SFZ preset that you want to use, and render. Hope this helped you guys! :)