Originally posted by goubejp If you understand french... look here :
Test_85mm
It compares Pentax A*85, FA*85, FA77, DA*50-135, Zeiss 85 and Samyang 85
Thank you so much for that link, one I had not seen before. Unfortunately it suffers from some of the usual irregularities in such tests. For example the FA77 is clearly mis-focused in "Test of resolution in landscape". Perhaps they were relying on AF? Hard to say, since they do not inform us.
The bokeh test is quite odd in that it does not provide a test bed for specular highlights, lights in background, reflections or any other common situation. In fact it seems that a less accurate lens might do better on their test.
Nonetheless, the advantages of the A* design over the FA* are plain. The Samyang is not usable unless stopped down significantly. And the Leica 80mm looks like the best lens to me. All results that conform with expectation.