I would be interested to hear any comments about people who have used the 80 mm Summilux-R especially compared to the 90 mm Summicron-R. I had a 90 mm Summicron-R and was very happy with it, but exchanged it for a late type 90 mm Elmarit-R (4 element one) because it was lighter and also because I felt that it's performance would be better than the Summicron. I have not been disappointed. It is smaller and it is also (probably) a better performer-but I miss the f2 of my Summicron! Rather than bear the humiliation of getting another Summicron I am wondering whether the Summilux might fit the bill nicely with an even wider aperture. How does the Summilux compare, performance-wise, to the Summicron? <p> I was never unhappy with the Summicron's performance but there seems no doubt to me that it is not as good as the 50 mm Summicron or the current 28 mm or f 3.4 180 Apo-Telyt-hence my original change. This is a classic case where optical performance is not everything. Should I seriously consider the Summilux? Thanks for your advice.