An 85mm portrait lens of f/1.2 has to be big and heavy. And it is. That's just physics, but it is exactly what makes the brand new Mitakon 85mm so fast and sharp at wide apertures. I had only a couple of days to play with this lens, but I tested it quite thoroughly at various apertures and lighting conditions. Optical properties at f/1.2 are just breathtaking. Chromatic aberrations only appear at really contrastive parts of the photo (classic branch-in-the-sky case) and the sharpness is just crazy. I feel like the lens designers have been paying a lot of attention to those new 30, 40 and 50-something-megapixel cameras. In case of this lens though I decided to stop down a bit for some of the photos as it helped edge of the frame sharpness considerably. The centre sharpness is very very good across the apertures.