I still prefer my Ultron 35mm f2.0 Vintage v. I, but the Summilux handled OK. Its focusing action is quite smooth and the lens is reasonably compact. Overall, this lens confirmed that I really don't need a faster 35mm than f2.0 for 99% of my photography with that focal length. But I applaud Leica for reissuing this lens, along w/ the M6.