The Zeiss Biogon-C f/2.8 gets a lot of praise. I have a Summarit and really like it. My go to lens in 35mm is the MS Optical Super Triplet Perar. At f/3.5, it's a bit slow, but it gets 50% of my shots in any focal length. I think you'll need to creep on Flickr and search for photos from various lenses to see what photos you like with them. I don't think you'll be disappointed in any of them though, from Voigtlander up to Leica.