Think Your Lens is the Sharpest Ever? Or is it Junk?

This has to be the clearest explanation I’ve ever read about why some lenses are awesome and some are just miserable. I’ve seen this myself – I had a 35-70 mm f/2.8 lens that was soft on every camera I owned at the time. I hated it, told numerous people to avoid it like the plague. But everyone else who had one loved it … whoops, my bad.