A 4000 DPI scan of 135 gives you 21 megapixels. So 36MP with a good lens will easily resolve just as much detail. There is not 60-70MP of information in a 4000 DPI scan, period.
For most films, anything beyond 4000 DPI is just going to help resolve the grain particles or dye cloud shapes. You have to be shooting slow fine grained BW with the best lenses to need more.
A 36Mp camera is not enough to best a 4000ppi scanner. You need about 60-70 mp to resolve the detail of a scan to similar level .
Even a layman can see the difference at 100%