There is this amazing scene at the end of Drive My car.  It won’t necessarily spoil anything to watch it now, so even if you haven’t seen it go for it (and then I totally recommend watching the whole thing!).  The setup here that of a “play within a movie” and within the plot it’s got this interesting conceit, that of that each (in-film) actor speaks their native language for their lines.  This scene is the final one of Uncle Vanya, and the (in-film) actress here does her bit in Korean sign language:

Just so deliciously powerful.  The (actual) actor and her acting is amazing, but her performance in how she harnesses the sign language to deliver it, signing both personally but also involving the other actor is brilliant.  All heightened by the expressive and nuanced sign language itself.  Absolutely wonderful.  (As is the rest, see the film!)