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I my archive I found some opinions of Pham Minh Son who tested many 180-200 2.0 lenses some years ago:
"Leica Apo Summicron-R 180 mm F2.0 - This is one of the kind lens in that it is so sharp and the focusing distance is much closer than the well known Canon 200 mm F1.8L. It is also rather compact for being at F2.0. This lens reminds me so much of the Zuiko 180 mm F2.0. However, in my test the Leica Apo 180 mm F2.0 has higher micro-contrast than the Zuiko lens. The bokeh of the Leica Apo 180 mm F2.0 is smooth and the colors is very pleasing and is well preferred by its users.
The Zuiko 180 mm F2.0 - This lens is a very beautiful lens. It is sharp and extremely well made. However, despite it has rare earth elements, the formula for this lens yield less resolving power than the Leica 180 mm F2.0.
Contax Carl Zeiss Tele - Apo - Sonnar 200 mm F2.0 - This lens is the most impressive lens in terms of its construction. The strengths of this lens is that the bokeh is the best in the 180 - 200 mm focal lengths, particularly yielding perfect circular blurred out background lights or lights piercing through the tree leaves. This lens is very sharp but not as sharp as the Leica Apo Summicron-R 180 mm F2.0 or the Canon EF 200mm F1.8L.
Canon EF 200 mm F1.8L - The legendary of this lens is one that I worked so hard to beat with other exotic lens but in the end the Canon EF 200 mm F1.8L is truly the king at these focal lengths in terms of resolving power in close and at infinity working distances. To me this lens has a special place in history like the Canon 1Ds. The only down fall of this lens is that you cannot get close enough to do some head portrait and the lenshood is very difficult to use which makes the lens bulky. All in all, performance alone, this lens is one that cannot be beat."
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