You can scan film at whatever resolution you want, but on average (and this varies between different stocks, different film speeds, different processing) you wo

You can scan film at whatever resolution you want, but on average (and this varies between different stocks, different film speeds, different processing) you won't get that much effective resolution from 35mm beyond 4K - you just start seeing the grains in more detail! And that is assuming a camera negative. A 3rd generation release print that has been played a few times can have less than 1.8K resolution.