I can't say I've found a Voitlander lens that doesn't make me happy with respect to comparisons to Leica lenses. I currently have the 12 and 15 (for which there are no real Leica comparables), the 21 Skopar (LTM version, which I find every bit the equal of my 21 Elmarit and saves me the bother of hauling that beast around unless I know I'll need the extra stop), the 28 Ultron (undoubtedly the 28 Summicron is better but I have a 28 Elmarit I use predominantly, the Ultron is there just for the far-fetched times I want another stop, and I paid a whopping $250 for it), and the 75 Heliar (which may not be 100% as good as a Summarit but darn close, and for the $200 it cost me, about a seventh the price). All of my Voitlander lenses were bought used, and I've had no mechanical problems with them at all. And at one time I also had the 90 APO-Lanthar, which was an excellent lens, but at that focal length I like f/2.8 as a minimum.