In the days of film, the magazines used to do lens tests and lenses that could resolve about 64 line-pairs/mm were ranked as 'VGood' and lenses with 80 l-p/mm were 'Excellent', and lenses in the 100-120 lp/mm were 'superb' and very exceptional to read about.
Now we see MTF tests like the Canon 35mm f/2 on a 21MPixel camera body, with over 3100 line-pairs/picture height wide open and 3500 l-p/picture height at f/5.6
- 3100 l-p/picture height = 129 line-pairs/mm at f/2
- 3500 l-p/picture height = 146 line-pairs/mm at f/5.6
One might be tempted to say we are in the 'superb' part of the test range, if one could truly compare the test values. But enough uncertainty about the test conditions being comparable exists that it is probably dangerous to jump to that conclusion.]
Then there is the scanner...a flatbed like the Canonscan 8800F has 4800 dpi in its scan settings for film ...that is about 2400 line-pairs per picture height or 100 l-p/mm. At best it is 30% inferior to the Canon 35mm f/2 on 21 MPixel camera body!