Olympus Zuiko Digital 50mm 1:2.0 Macro - £580
Sharpness isn't that great wide open, with some of the weakest results out of the eight lenses, but at small apertures sharpness is excellent.
The centre of the frame shows low fringing, and although this rises slightly towards the edges, it's kept under control.
The Olympus produces the most distortion in the test, and significantly more than the next worst lens, the Nikon 105mm.
Image test verdict
Control over chromatic aberration and sharpness is excellent overall, and even when you get to the narrowest apertures, results are still good.