This week the folks at Leica revealed the Leica APO-Summicron-SL 50 mm f/2 ASPH lens, a new member of the SL lens family with twelve lens elements arranged in ten groups. In the mix are three lenses with aspherical surfaces in place specifically for correcting optical aberrations. Users will find this lens in stores online first, then in physical stores very, very soon.
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https://www.slashgear.com/leica-apo-summicron-sl-50-f-2-asph-official-with-beastly-specs-15587345/