You are going to laugh, I am thinking of selling both to get a 50 Summilux. I do love the 50, it is a great lens, but I also have a rigid Summicron which is a perfect match for my M3 and the lux will take the role of 50 on my M6. The 35 is also a wonderful lens. But, every time I use it I want to sell it, until I get the photos developed and see how wonderful they look. It is a small stubby lens with the clumpy nob. Those are the things everyone else in the world loves, I just don't like the ergonomics of the lens.
I need to make sure I won't regret these sales, but this is where they will be listed.