35mm fullframe comparison 0.95 1.2 f/0.95 f/1.2 voigtländer laowa viltrox sigma lab argus nokton art dg dn contrast resolution bokeh vignetting coma sharpness loca ca35mm fullframe comparison 0.95 1.2 f/0.95 f/1.2 voigtländer laowa viltrox sigma lab argus nokton art dg dn contrast resolution bokeh vignetting coma sharpness loca ca