I've got a chance to buy this useful suite of lenses: Ultron 28mm f/2 (Leica M) Nokton 50mm f/1.5 (Leica screw) Color Heliar 75mm f/2.5 (Leica screw) All recent lenses in mint condition. Does anyone have personal experience of these lenses? I'd sell my mint Contax Carl Zeiss 50mm Planar f1.4 T* to help pay for them. I'll miss it but it is a big heavy lens with a long adaptor. The adaptor I have for Leica lenses is much shorter and neater. Will I be making a big mistake selling the Zeiss?