I have it from a book: Science for the Curious Photographer (page 138)
I end this section with some estimates of the dynamic ranges associated with various imaging
systems. These numbers have large errors because estimates of noise and visual quality are subjective and
technology continues to improve. As before, one stop represents a factor of two and n stops means a factor
of 2n :
Sensors (DSLR): 10 - 14 stops (RAW readout)
8 – 9 stops (JPG readout)
Color print film: 7 stops
Color slide film: 5 stops
Human eye: 5 - 7 stops (fixed retina -without iris change)
It may depend a bit on the interpretation of dynamic range. Also print film can be overexposed a lot it saturates smoothly, and that may be interpreted as extended DR.
I always thought negative film had about 11 or 12 stops of DR, compared to about 6 stops for positive film.