Leica Summilux-M 35mm f/1.4 ASPH FLE (11663)

Frame a face at 0.7 meters and a street at infinity on the same roll, and the older 35 Summilux ASPH made you pick which one would be sharp. Peter Karbe and the Leica optics team built this 11663 to stop making you choose. The FLE in the name stands for Floating Lens Element, a group inside the barrel that moves as you focus. It earns its keep close up, where it corrects the focus shift that plagued the 1994 design. Leica shipped it in 2010 to replace a lens that had run the M system for sixteen years. For a rangefinder shooter working both ends of the focus scale, that floating group is the entire reason to spend the money.

Wide open at f/1.4 it is already working, which was not always true of fast 35s. Center sharpness is high from frame one, the corners catch up by f/2.8, and by f/4 the whole field is even. Microcontrast runs high, color stays neutral, and the focus falls off in a way that lifts a subject off its background without the busy swirl of older glass. Bokeh is smooth and a touch clinical rather than dreamy. Flare control is strong for something this fast, though aim it at a bright point source and you will catch some veiling.

This is a reportage lens. A 35mm on an M body is the working photojournalist's default, and at f/1.4 it shoots a dim bar or a doorway where a Summicron f/2 would force a push you did not want. People who buy it are shooting motion and low light and faces, not chasing corner resolution on a landscape, and they want one lens that handles the whole assignment.

The honest weakness is what is left of the focus shift. The FLE cut it down hard against the pre-FLE 11874, but a small residual still nudges the plane of focus back slightly as you stop toward f/2.8, and on a rangefinder you cannot see it the way live view shows it. Most shooters learn the lens and forget about it. A beginner blames their own technique for frames that are actually the design. The other weakness is the bill. This lens runs well past a thousand dollars used and resale stays sticky, so you are not getting in cheap.

People cross-shop it against the 35 Summicron ASPH, smaller and cheaper and arguably crisper once stopped down, and against the Voigtlander 35mm f/1.4 and f/1.2 options that get you most of the look for a fraction of the outlay. The Summilux holds its ground on the extra stop, the close-focus correction, and a resale curve that barely sags. The 46mm thread takes screw-in ND and grads cleanly. When you are wide open in a dim room, set Zone Light Meter to f/1.4 and read the shadow you actually care about, so the speed buys you a placed exposure and not just a brighter mistake.