The reported 1.4x magnification, which should be written 1.4:1, not 1:1.4 reproduction ratio would be interesting and useful. However, as a specialist field macro photographer for a long time this is not enough. It doesn't even give the frame filling power on FF that you get with a 1:1 lens on a crop body, an effective 1.6x magnification. This is not enough to fill the frame with an average sized fly, let alone a smaller insect or flower part. 2x magnification would be much more useful. It's always been a difficult task using the MP-E 65mm and a 1:1 macro lens like the 100mm L IS f2.8, because you have this abrupt jump from 1:1 to greater than, and a lot of subjects span this gap. Even if you use 2 bodies you have to keep switching from one to the other. So you have to use extension tubes or close-up lenses, because the 100mm L won't take a converter.