Digital BW, The Print

By the way, I've placed a JPG of many relevant MTF charts at 
http://www.paulroark.com/BW-Info/MTF%20charts.jpg

Most are Canon or Zeiss lenses for the EF mount.  I've included some Leica lenses for comparison.  Note that Photodo, tested at 10, 20, and 40 lp/mm, as does Zeiss.  Canon tests at 10 and 30.  So, the Canon charts are not very comparable.

The easiest way to tell the difference between the lenses is to look at the thin dotted line near the edge.  I crop and tend to not worry too much about the very corner.

Paul
www.PaulRoark.com