I had the non-AI 1.8 and it was tack-sharp but heavy. I've thought about the 85/2 and have held off because of so-so reviews also. For now, sticking with the 105/2.5 and I prefer the 90-Elmarit (last series) rather than the Summicron on my R's. I'd love to have the 1.4 but can't justify the cost!