trying to find a reasonably priced portrait lens for an LTM system proved a challenge. the online cognoscenti tend to trumpet the late canon 85/1.8 and the nikkor 85/2, both of which are difficult to find and horribly overpriced. wary of focus compatibility problems, i avoided the soviet jupiter 9 and resigned myself to "settling" for one of the "inferior" early canons. as luck would have it i found a serenar 85/2 with a slightly dented filter ring on the 'bay for about $150. i recently shot a couple rolls with it at my most recent model shoot. i kept the aperture at about 5.6 and am quite pleased with the results. it's sharp, has soft and smooth out of focus rendition ("bokeh", to be fashionable), and no obvious softness or vignetting at the corners. so just what is it that the newer canon or nikkor are supposed to do better? also, does anyone know definitively whether these early canons had a sonnar or planar optical formula? online sources seem in conflict on this point. thanks.