But it doesn't apply only to home video. The new 'reimaginings' are universal masters for any future television, streaming, disc, and theatrical releases. The only way to see something resembling the original presentations might be if Tarantino has original prints which he'll screen at the New...
For whatever reason, large format fell out of favour for a while. Hardly anything was shot in large format between the early-70s until Christopher Nolan's embrace of IMAX with The Dark Knight.
Release prints have less grain, or at least less noticeable grain. It tends to get smoothed over and gives the image a more textured, rather than grainy look.