I've just bought a Planar, and shot my first images tonight - it's my only modern lens (I usually tend to prefer older, lower contrast lenses). I was originally choosing between a modern Sonnar and a vintage Sonnar. In the end I decided to get two lenses for my money - a secondhand ZM Planar for the modern look with its sharpness and higher contrast, and I'm now looking around for a Jupiter 3 for the Sonnar and vintage look. The images in this thread are very impressive and had much to do with my final decision.