M_BH vs. L_bol for quasars. The masses plotted are estimated from different emission lines and monochromatic luminosity found to date (Peng et al. 2006; Assef et al. 2011; Sluse et al. 2012; Ding et al. 2017). For lensed quasars, black open diamonds correspond to the M_BH derived from the Mg II and CIV emission lines, black open triangle correspond to the Hα emission line, and black filled triangles to the Hβ emission line. For non-lensed quasars, Shen et al. (2019) data for M_BH from SDSS are represented by the gray dots and gray contours. The average M_BH mass estimation for WG2038-4008 is represented as blue, red, and green triangles for Mg II, Hβ, and Hα emission lines.