Josh Ewing wrote an answer about La Sportiva Katana Lace Vibram XS Edge Climbing Shoe on January 26, 2013
I wear a 40.5 Miura VS for bouldering and hard sport. 41.5 Miura for granite routes and comfy sport climbing. 42 TC Pro with flat toes for off widths and hand cracks. 43 Katana Lace for flat toe action in finger cracks. It seems to run small, IMO.