Cherukuri Kiran Kumar

I am new to the film industry. i was talking to a cinematographer yesterday about red camers footage. during the discussion i happened to mention film grain. he said that grain doesnt show nowadays because film available now is totally clear of noise. further he said that lenses are also so advanced that vignetting doesnt occur anymore. according to what i have seen or learnt so far, this seems illogical, but hearing that from a senior, i'm confused. somebody please provide me the right info.