There are always positive and negative aspects of a product. He is compared to other '50s heavy, large ... But no other 50s to 5000 does what he does ... Damn good photos. This is the area where a photograph can say that these photos are total scrap and other immediately falls in love. My only comparison is: Canon 50mm 0.95 "Dream Lens". Very hard to get and often dirty. Mitakon the new Dream Lens!