Distribution of the logarithmic Eddington ratio, log(L_bol/L_Edd,Mg II), for our dataset (teal filled histogram) and for the SDSS DR7, WISSH, XQ-100, E-XQR-30, Yang et al. (2021), and Farina et al. (2022) samples, reported for comparison. We have not included in the histogram the two Eddington ratio estimates for J1335-0328 and J1022+2252, that exploit the C IV black hole mass measurements to derive L_Edd. These objects are both classified as super-Eddington (Table B.1).