You have only mentioned prime lenses. However the Olympus 35/70 F3.6 constant apperture lens is just about the sharpest lens I HAVE EVER USED! Their quality is shown by how much they cost when new. In UK I doubt if you will find one which is perfect for less than 130. These lenses when they were being sold new were priced around the 300+ mark and this was perhaps 15 years ago. The other two version sold by Olympus the F3.5-4.5 and F4 constant were less than half that.