I can remember reading the artice! The 50mm lenses and the 24mm lens are superb. The article's conclusion about the 200mm lens surprised me so I carried out some tests myself. They were not very scientific, I just shot a scene with different lenses and compared the images side-by-side. Eventually, I managed to compare the 200mm f4, 200mm f5, 180mm f2.8 and the 65-200 f4 zoom (at 200mm). In descending order of sharpness (at f8): f4, f2.8, f5, f4(zoom). In descending order of colour fringing (at f8): f4, f5, f4(zoom), f2.8. The f4 and the f5 lenses were quite similar. Overall, I was pleased with the 200mm f4 and it was the only lens I kept. I felt it was worth having the extra 2/3 stop (over the f5). The biggest suprprise was the colour fringing of the 180mm f2.8. That said, I have a 50 x 30 cm print on my wall taken with this lens and, although I can see colour fringing if I really look, I don't think it detracts from the photo.