A wise photographer once told me, the quality of a lens can be tested by whether an image of a Nopal/Prickly Pear cactus needle is sharp enough to draw blood!
Ouch!!!

This photo was taken by a Kowa/SIX medium format film camera and KOWA LENS-S 1:3.5/150mm lens using Kodak Portra 400 film, the negative scanned by an Epson Perfection V600 and digitally rendered with Photoshop.