Leica used that thorium glass 40 years before Canon. Dont believe the myths , rent a Leica and Canon , shoot head to head and you will understand. For me , Canon is a tourist camera , no more and not every tourist uses it , if they dont want to have chromatic aberration , ugly colors , terrible bokeh and a body like an shoebox in your hands. I bought an EOS and when the trees comes blue , I sold it. Long story about an tard.