If you go to Erwin Puts site, you will be able to read the freshly released initial appraisal of the new Leica Summarit lenses. Well, the punch line is, the Summarit line is supposed to be "not perfect" (not as good as Summicron) but good enough in Leica standards, and with an "acceptable" price.
Well, my point of view is, that the Zeiss lenses, not only have a lower price than the Summarits, but are actually better than Summicrons - "better" being as always a bit subjective, but concretely being related to an all-round vote regarding how these lenses draw in all circumstances, at all distances and with various types of film. I think, if I never had known a ZM lens, I'd probably be raving about Leica's lenses, but once you see a ZM drawing, it is difficult to look back: you get a pre ASPH drawing with the ASPH sharpness and the unique Zeiss 3d effect and flare resistance, and all this at 1/3rd of the price - where is the dilemma? There's no dilemma, the Zeiss lenses are the ones to beat, regardless the price advantage... The Biogon 35 is the obvious choice, unless you want to wait for a 35/1.2 Distagon, which , I believe, is round the corner.