Most of them aren't free. I do some design work that relies on a lot of various typography, so I have a library of fairly high-quality fonts (HF&J, FF, a few other smaller foundries). Although ones that I noticed a big difference was Athelas & Elena, which comes pre-installed on any modern Mac.
Just looking over my list of fonts, I believe "Andada" is a free font that renders slightly better with OTF versus TTF, but it definitely wasn't the most dramatic. Biggest differences were with serifed fonts; the ones that were dramatically better to my eyes were Calluna, Elena, Tiempos Text & Tisa.
EDIT: I might run into some time tomorrow night that I could test it and take a few screenshots. Not sure yet. Also I'm running on a Kobo Aura.
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