Just posted is my take on the new Leica 35mm f/1.4 Summilux-M ASPH, which I deem the 2010F for its floating lens element. The 35mm focal length is the very best first choice ergonomically for the Leica M9, because it offers a generous view that is not too large for the eye to survey.
Construction is similar to the 21/1.4 and 24/1.4 Summilux-M ASPH lenses, with the screw-on rectangular lens hood. I’m big fan of the slide on / slide off lens cap, though it's a bit loose and means I’ll probably lose it.
I’m not a fan of the “tabbed” focusing approach of the 35/1.4 and other Leica M lenses (good for quick and coarse focus, but terrible ergonomics for fine focus), I much prefer the ribbed focusing ring of the 21/1.4 Summilux-M ASPH, but that’s probably a sacrifice due to the compact size.