There's not too much information out there, as far as I can tell. I notice that there are a lot of 50mm f/2.8 LTM lenses out there by Fuji, Canon, Yashica and Minolta. There is of course the Leica 50 Elmar, too. So, out of those lenses, which is the best performer? I am more interested in consistency across the frame, even if it means less centre resolution. Low distortion, low CA are also desirable.