Hi guys, my new year's resolution was to self impose a one-lens policy for my RF which was the 50 summilux (I know it wouldn't last long!). But the new year seems to be far away now, it's mid-way through the year, I thought of considering my next RF lens. And I wanted to make some sense about the word "interchangeable" . After serious contemplation, I pretty much boiled it down to 28mm. (Yeah I know I would need a 35 someday LOL!) Which will you choose? The Elmarit being more compact at 2.8, but the Summicron 28 at F2 and same filter thread at 46mm makes a good choice too. I have tried the Summicron while at Leica SG (and probably that was to my detriment!).