>>2882031M8, if you can't see the fucking difference in apparent grain between small format and medium format, I can't help you.
Pic related is Konica 160 colour neg on the left, with a mid-90's expiry date. The foreground is probably between 2 and 4 stops underexposed?
On the right is some fresh Fuji 400 exposed for the sky.
Even comparing fucked film to good film, correctly exposed to underexposed, there is no comparison.